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Under Armour Flyweight Women's Running T-Shirt ×

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Under Armour Flyweight Women's Running T-Shirt ×

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Under Armour Flyweight Women's Running T-Shirt

RRP £24.99 |
SAVE £10.00

Out Of Stock

Due to manufacturer's restrictions we are unable to ship Under Armour products to Great Britain.
If you have any questions please call us on: +44 (0)1274 530 530 or email:

Product Details

Power Mesh panelling positioned across the back of the Under Armour Flyweight Women's Running T-Shirt enables it to breathe and thereby regulate the wearer's temperature, particularly across critical heat zones. Under Armour's signature Moisture Transport System wicks sweat away from the body to encourage a cooler, drier environment, whilst anti-odour technology eradicates odour propagating bacteria before it has a chance to spread.

Ergonomic flatlock seams reduce bulk, chafing and subsequent irritation, whilst 50+ UPF protection protects the skin from harmful UV rays. Additionally, a pliable, inherently flexible construction accommodates a full range of motion and unimpeded comfort.

Reflective components preserve the wearer's visibility in diminished light.


  • HeatGear® Flyweight Fabric - Lightweight and smooth, this functional material blend sits comfortably against the skin whilst delivering peerless technical performance.
  • Power Mesh Panelling - Encourages increased airflow across the rear.
  • Moisture Transport System - Wicks excess sweat away from the skin and onto the garment's surface, from which it evaporates.
  • Anti-Odour Technology - Quells the spread of odour carrying microbes.
  • 50+ UPF Protection - Protects the skin from harmful UV rays.
  • Drop Tail Hem - Delivers increased coverage.
  • Ergonomic Flatlock Seams - Minimise chafing and the associated risk of skin irritation.
  • Lightweight, Pliable Construction - Accommodates a full range of motion and unimpeded comfort.
  • Reflective Components - Preserve the wearer's visibility in diminished light and yield 360 degree reflectivity.
  • Reflective Components - Preserve the wearer's visibility in diminished light and yield 360 degree reflectivity.
  • Construction - Body: 90g polyester.

Manufacturer product code - UND1236474501

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Size Guide

  • 1000 Mile
  • 2XU
  • Adidas
  • Anatom
  • Asics
  • Asolo
  • Avia
  • Backjoy
  • Brooks
  • Buff
  • Camelbak
  • Canterbury
  • Carta Sport
  • Champion
  • Columbia
  • Compeed
  • Craft
  • Darn Tough
  • Deuter
  • Dynafit
  • Falke
  • Fitness Mad
  • Freet
  • Garmin
  • Gore
  • Haglofs
  • Head
  • Helly Hansen
  • Hi-Tec
  • Higher State
  • Hilly
  • Hoka One One
  • IceBreaker
  • Inov8
  • K-Swiss
  • Keen
  • La Sportiva
  • LED Lenser
  • Lizard
  • Lorpen
  • Magnum
  • McDavid
  • Merrell
  • Mizuno
  • Montane
  • Montrail
  • Mueller
  • MuscleAidTape
  • Muscletrac
  • Nathan
  • New Balance
  • Newton
  • Nike
  • Noene
  • Nordisk
  • OMM
  • Optimum
  • Passback
  • Polar
  • Puma
  • Pure Lime
  • Reebok
  • Regatta
  • Rocktape
  • RonHill
  • Runaid
  • Salewa
  • Salming
  • Salomon
  • Saucony
  • Scarpa
  • Shock Absorber
  • Sidas
  • Silva
  • Silverpoint
  • Skins
  • SmartWool
  • Sofsole
  • Sorbothane
  • Spidertech
  • Sprayway
  • Sugoi
  • Sugru
  • Sunwise
  • Suunto
  • Teko
  • Teva
  • Thorlo
  • Thuasne
  • Timberland
  • Timex
  • TomTom
  • Trainahead
  • Trigger Point
  • Trionz
  • Ultimate Performance
  • Under Armour
  • Vaude
  • Vibram
  • VivoBarefoot
  • Walsh
  • X-Bionic
  • Xtenex
  • Yaktrax
  • Yonex
  • Zamberlan
  • Zoot

Under Armour Size Guide

Shoe Guide
UK 6 6.5 7 7.5 8 8.5 9 9.5 10 10.5 11 11.5 12 12.5 13 13.5 14 14.5 15
US 7 7.5 8 8.5 9 9.5 10 10.5 11 11.5 12 12.5 13 13.5 14 14.5 15 15.5 16
EU 40 40.5 41 42 42.5 43 44 44.5 45 45.5 46 47 47.5 48 48.5 49 49.5 50 50.5
UK 5 5.5 6 6.5 7 7.5 8 8.5 9 9.5 10 10.5 11 11.5 12
US 6 6.5 7 7.5 8 8.5 9 9.5 10 10.5 11 11.5 12 12.5 13
EU 39 39.5 40 41 42 42.5 43 44 45 45.5 46 47 48 48.5 49
86 - 91
34"- 36"
97 - 102
38" - 40"
107 - 112
42" - 44"
117- 122
46" - 48"
127 - 132
50" - 52"
137 - 142
54" - 56"
71 - 73
28" - 29"
76 - 81
30" - 32"
86 - 91
34" - 36"
96 - 102
38" - 40"
107 - 112
42" - 44"
117 - 122
46" - 48"
78 - 83
31" - 33"
85 - 90
33.5" - 35.5"
91 - 96
36" - 38"
97- 103
38.5" - 40.5"
104 - 109
41" - 43"
109 +
43" +
58 - 63
23" - 25"
64 - 69
25.5" - 27.5"
71 - 76
28" - 30"
78 - 81
31" - 32"
83 - 88
33"- 35"
88 +
35" +
83 - 88
33" - 35"
90 - 95
35.5" - 37.5"
96 - 102
38" - 40"
103 - 108
40.5" - 42.5"
109 - 114
43" - 45"
114 +
45" +


Child Size 8 10-12 14-16 18-20
66 - 71
26" - 28"
71 - 76
28" - 30"
76 - 81
30" - 32"
81 - 86
32" - 34"
58 - 61
23" - 24"
64 - 66
25" - 26"
66 - 69
26" - 27"
71 - 74
28" - 29"



Can I return an item I'm unhappy with?

Yes, provided it's in perfect condition with labels intact and you return it within 14 days of receipt. Please see our Returns section for more information about how to return.

Do I need to tell you when I'm returning something?

No, there's no need to contact us before returning your parcel.

Do I need to pay the postage costs to return the item?

Yes, you will need to pay the return postage costs. We also advise that you make sure you have sufficient postal insurance, just in case your parcel goes missing on the way back to us.

Do you have a collection service?

Unfortunately we're not currently able to collect returns - you will need to post your item back to us.

Will I have to pay postage again for my exchange to be sent?

No, we'll cover this cost - we won't charge you any additional postage for sending an exchange. We'll send your exchange using standard delivery.

How long will it take for you to process my exchange?

We aim to despatch your replacements within 24 hours of receiving your return, then our usual delivery times apply.

How long will my refund take?

We'll try our best to process your refund within 24 hours of receiving your return but please allow 7 days for busy periods. Don't forget that once we've processed your refund, it can take up to 72 hours to show up in your account.

How will I be refunded?

We'll refund you via your original payment method, except in the case of postal orders where we'll refund you by cheque.

I want to return my goods but I'm outside of the 14 day period. Can I still return them?

Yes, provided you return them within a reasonable time after purchase and they're in perfect condition. We're unable to issue refunds for items returned outside of the 14 day period but we can exchange your item or give you a credit note.

My goods are faulty - can I return them?

Yes, please return them in the usual way and we'll take a look at them. Don't forget to include all of your details plus any information you think might be helpful. If your item has a manufacturing fault, we'll exchange it for you or give you a refund.

Can I return a personalised item?

Unfortunately, personalised items are non returnable unless they're found to be faulty.

More information

We understand that sometimes you'll need to return items to us and we've made this easy, fast and simple.

Our no quibbles returns policy means that if you're not 100% happy with any item we send to you, we'll happily exchange or refund it for you.

When you receive your item you have up to 14 days to change your mind and send it back to us.

We'll exchange or refund all items which:

  • Are returned to us within 14 days of receipt.
  • Are returned to us in perfect condition, with their original packaging and with the labels attached.

Your statutory rights are not affected.

How to Return

Wrap securely in a bag or paper, taking care not to damage the product packaging and post to:

  • Returns Department
  • 1 The Park
  • Jubilee Way
  • Shipley
  • West Yorkshire
  • BD18 1QG

Please enclose your invoice, letting us know what action you would like us to take, eg. exchange or refund. This will help us to ensure we process your return quickly and efficiently.

You'll need to pay the postage costs to return your parcel. We recommend that you ensure you obtain sufficient postal insurance in case your item goes missing on its way back to us.

If you have any enquiries about returning your item(s), please feel free to email us at


  • When returning your item, remember to include the code and size of your replacements.
  • We'll despatch your replacements postage free to UK addresses.
  • We'll turn around your exchange as quickly as we can and subject to stock availability, aim to despatch your replacements within 24 hours of receiving your return.
  • Bear in mind that there may be slight delays during busy periods.


  • We'll refund your item via your original payment method except in the case of payment by cash or postal order where we will refund you by cheque.
  • We try our best to process all refunds within 24 hours of receipt, however during busy periods allow 7 working days for your refund.
  • When we've completed your refund, we'll send you an email to let you know.
  • Please note: Gift wrapping is non-refundable

Faulty Items

If you find a fault with your item, send it back to us and we'll take a look at it as soon as we can. If we find a manufacturing fault, we'll happily replace or refund it.

Faulty items should be returned within a reasonable time and preferably in a clean and dry condition. Please enclose all your details and a covering note explaining the fault and any other useful details. We'll try to get back to you within 24 hours of receipt of your parcel, although during busy periods this may take slightly longer.

Occasionally, if we're struggling to locate a fault, we may request a second opinion from the product manufacturer.

Your statutory rights are not affected.


Select an alternative delivery country below to see our shipping rates for other countries

Shipping to {$UserCountry->printableName()}
Service Price Delivery Estimate
UK Standard £ 4.99 3-5 Days
UK Next Day £ 8.99 Next day (if ordered before 3pm)

Under Armour Technology


A little bit about Under Armour...

It started with a simple plan to make a superior t-shirt. A shirt that provided compression and wicked perspiration off your skin rather than absorb it. A shirt that worked with your body to regulate temperature and enhance performance.

Founded in 1996 by former University of Maryland football player Kevin Plank, Under Armour is the originator of performance apparel - Gear engineered to keep athletes cool, dry, and light throughout the course of a game, practice, or workout. Under Armour was founded with a mission: To make all athletes better through passion, design, and the relentless pursuit of innovation.

Today, Under Armour is a leading developer, marketer, and distributor of branded performance apparel, footwear, and accessories. The brand's moisture wicking synthetic fabrications are engineered in many different designs and styles for wear in nearly every climate to provide a high-performance alternative to traditional natural fiber products. While the technology behind Under Armour's diverse product assortment for men, women, and youth athletes is complex, the program for reaping the benefits is simple: Wear HEATGEAR when it's hot, COLDGEAR when it's cold, and ALLSEASONGEAR between the extremes.

Under Armour's innovation story continues with the introductions of COLDBLACK, fabric that reflects the heat of the sun, keeping you cool; UA CHARGED COTTON, the world's first performance cotton apparel, which includes UA CHARGED COTTON STORM, a line of water resistant hoodies and pants; UA GREEN, a line of performance apparel built from recycled materials, and the E39 COMPRESSION SHIRT that measures breathing rate, acceleration, and heart rate which debuted at the 2011 NRL combine. The brand also introduced the UA CHARGE RC Running Shoe - Expertly engineered using Under Armour's apparel DNA to provide the ultimate fit as a premier speed runner.


Three different types of Gearlines:

It's very simple, COLDGEAR are designed for those cold weather to keep you warm, ALLSEASONGEAR are designed for when the temperature is between the extremes, this provides ultimate comfort at all time. While HEATGEAR are designed for warm weather to keep you cool by its very efficient sweat wicking properties. Figures below shows more informations you need to know about those technologies.



HeatGear® Sonic

HeatGear® Sonic allows athletes to feel more comfortable in baselayer apparel than even before, due to the use of a lighter fabric that is incredibly durable and has more balanced stretch numbers. This means that athletes are locked-in and secure without too much squeeze. It means the days of compression shirts riding up during play are gone.



The Under Armour Catalyst Shirt, made from recycled plastic bottles, blurs the line between science and nature. Designed to respond to quick moves, and engineered to increase stamina, even during your most intense cross training sessions. A specialized process recycles plastic bottles and transforms them into a soft but durable yarn that is then knitted into Under Armour performance fabric.



Charged Cotton

Under Armour took the Go-To Cotton T-shirt and fused it with UA innovation to make the world's first true performance cotton shirt. A game-changing cotton t-shirt that dries up to 5 times faster than ordinary cotton.

  • Strands of Pima cotton are treated, or "Charged", with a water-repellant finish to become hydrophobic (Moisture hating) and others are left in their natural state, which is Hydrophilic (Moisture Loving); these strands are woven together into charged cotton fabric.
  • The Hydrophobic strands repel moisture to be absorbed across a greater surface area and therefore to evaporate much quicker than regular cotton.
  • As the sweat is pushed and pulled to spread across the fabric, sweat lines appear, which proves it is working.


Storm Charged Cotton

You can stay dry and warm in the world's best water-resistant cotton. The Storm Charged Cotton may feel like a regular cotton sweatshirt. Its unique, water-resistant finish actually repels water, without stifling airflow. You'll never be weighed down by training in rain again.

  • Charged with a water-resistant finish - Keeps you warm, dry and light
  • Cotton products: 100% water repellent before wash and 70% water repellent after 30 washes.
  • Poly products: 100% water repellent before wash and 80% water repellent after 20 washes.


Cold Black

Ordinary fabric absorbs UV rays and gets hot. Revolutionary new ColdBlack reflects them - so you feel cooler, sweat less and stay focused.

  • Coldblack is a fabric dye, that does not wash out unless bleached.
  • Minimum UPR +30, shielding your skin from harm.
  • 60% infrared ray reflectance.



Compression built specifically to help get an athlete back to full strength fast following training or competition.

  • During training, your muscle fibers get damages, then water invades your muscles as they heal, but water slows down the process. Recharge targets muscles, pushed the water out and enables your muscles to mend faster.
  • Strategic compression targets muscles to reduce swelling and decrease soreness times.
  • Dynamic casting effect aligns and stabilizes muscles, so they can repairs themselves better.
  • Specifically designed resistance range according to the UCONN to create desired amount of pressure.

Performance Layer:

Base Layer - Transports moisture away from your body, keeping you dry and comfortable. Fits close for support, engineered for a snug feel against the body.

  • Base 1.0 - Super-lightweight layer for cooler temperatures and higher activity levels.
  • Base 2.0 - Highly versatile midweight layer for colder conditions and a variety of activity levels.
  • Base 3.0 - Maximum warmth layer for extreme cold conditions and lower activity levels.
  • Midlayer - Provides insulation, keeping your core at the right temperature. Fitted to the body, but not tight.
  • Outerwear - Protects you from the elements, so you can enjoy outdoor activities longer. Generously cut for comfort, with maximum range of motion and a full, loose fit.

Fit Guide:





Benefits of Compression

Whether it's training or gameday, your UA compression base layer makes you better. UA compression unleashes the power of muscles and keeps you stronger for longer.



Reduces muscle vibration to lessen fatigue and maintain power output. Keeps muscles aligned correctly to increase repetitive muscle power.



Enhances proprioception - The body's recognition of muscle patterns and spatial awareness - To increase muscle efficiency.



Creates a healing environment around muscles and circulatory system. Post-workout, reduces swelling, decreases soreness time and promotes muscle repair.



Wicks moisture to keep you 53% lighter than cotton after 60 minutes of athletic performance. Speeds evaporation to regulate your core temperature.

Tech Lists



Fabric technology that neutralizes the microbes that cause odour before there’s any odor at all, resulting in moisture transport with maximum scent suppression.



Polyester fabric that wicks perspiration and dries quickly to provide maximum moisture transport and temperature regulation in hot or cold conditions.



Ultralight polyester microfilament insulation that provides maximum thermal protection with minimal weight.



Knit fabric with a brushed or sheared surface that traps heat in the air pockets between fibers, providing warmth without bulk.



Waterproof, breathable fabric technology that features fully taped seams.



Breathable fabric designed to provide ultraquiet protection and temperature regulation in extreme weather conditions; recommended for hunting.



Lightweight fabric with built-in four-way stretch that improves mobility and accelerates drying time.


UA Tech™:

Delivers lightweight moisture-wicking performance with a cotton-like feel.


UA Capture™:

Ultimate base layer collection that filters odors before they can be detected. Odour is absorbed into a polymer shield that is bound to the inner surface of the fabric, while breathability, moisture management, and lightweight performance are maintained.


UA Metal™:

Most luxurious collection in the Under Armour arsenal, built with “premium technologies for maximum performance.


MPZ (Modular Protection Zones):

Durable, lightweight protection at key contact points without sacrificing compression support.


Wind Resistant:

Blocks wind from penetrating the body. Helps regulate core body temperature.



Locks gear in place using a tactified compound that prevents slippage.


360 Reflectivity:

The high visibility solution for training safely during low light conditions.


Rain Resistant:

DWR finished garments resist rain/water, keeping the body protected and dry.


Strategic Ventilation:

Strategic venting built into garmet at key points where the body dumps heat. Keeps the athlete cool in hot conditions.


Moisture Transport:

Wicks moisture from the body, keeping the athlete dry.



Ultraviolet protection shields your skin from the sun's harmful rays and inhibits premature aging.


Odour Control:

Fabric treated with antimicrobial agents to keep your body fresh at all time.

Flatlock Stitching

Designed to eliminate bulk at the seams of Under Armour tops and bottoms. While regular seams use a “fabric allowance” that creates bulk and can cause chafing and discomfort, flatlock-stitched seams lie flat, resulting in a sleeker look and feel.

Raglan Sleeves

Different from typical tee shirt sleeves. Constructed with long, slanting seams that extend from the neckline and continue around the armhole, leaving no shoulder seams. This style gives shirts increased comfort and freedom of movement.

Thermal Grid Fabric

Constructed with a network of grid channels that trap more air while using less yarn. This makes Under Armour’s base layers incredibly lightweight and quick-drying while keeping your core temperature regulated, enabling maximum performance in a variety of conditions.

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