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Choosing Under Armour women’s sportswear: how to find the right fit and fabric

A sports top may look comfortable in the product photo, but feel too warm or too tight at the gym, or quickly lose its shape. When choosing Under Armour women’s sportswear, it’s not just about the colour or the brand name. The fabric, fit, sizing and care instructions all determine whether a garment is right for fitness, training, everyday wear or relaxing.

Pay attention to marketing terms, too. “Breathable”, “quick-drying” and “moisture-wicking” sound useful, but they only tell you so much unless the product specifications explain what the garment is made from and how it is designed to be worn.

Three common sportswear pitfalls

1. Misjudging a loose or tight fit

A regular fit is generally classic in style and not especially roomy. A loose fit gives you more freedom to move, but can feel baggy during certain exercises. So, when choosing a women’s sports T-shirt or sports vest, compare your bust measurement and the stated fit with your own measurements.

A top that’s too small can pull across your shoulders and arms as you move. A style that’s too roomy may shift during strength training or cardio. So don’t just go by the letter size: check the size guide in centimetres, too.

2. Confusing “cotton” with technical sports fabric

Cotton often feels soft and natural, but holds on to moisture for longer than many synthetic fabrics. Polyester or a polyester-elastane blend is often used for breathable, quick-drying sportswear. That doesn’t automatically mean every polyester top performs in the same way.

According to the relevant brands’ product information, features such as moisture-wicking, quick-drying and odour-control properties may be part of the design. Treat these as product specifications, not as a guaranteed experience for every wearer.

3. Looking only at the colour and price

A black sports vest can be versatile, but the right choice also depends on how you’ll use it and care for it. A lightweight women’s vest top makes sense for intense workouts in a warm room. A cotton T-shirt or fleece shorts may be more comfortable for warming up, wearing at home or relaxing.

Check the care instructions, too. Some Under Armour styles can be tumble-dried at a low temperature, but aren’t suitable for ironing, fabric conditioner or dry cleaning.

Which specifications matter?

Fabric and moisture management

For sportswear for fitness, three things are worth considering:

  • Polyester: a lightweight fabric that, according to the product description, can dry quickly and is suitable for active movement.
  • Elastane: adds stretch, helping a vest top or sports T-shirt move more easily with your body.
  • Cotton or a cotton blend: feels soft and works well for casual sportswear, but may hold on to moisture for longer.

According to the product information, a women’s sports vest made from 90% polyester and 10% elastane, such as the Tech Knockout Tank, offers four-way stretch. This can be useful for exercises that involve a lot of arm movement. A 100% cotton style, such as the Tech Tank Twist, has a different fabric composition and is described as feeling more natural.

Fit and size

Use the size guide to check your measurements. For example, some Under Armour women’s styles give the following bust measurements:

  • XS: approximately 83–85 cm for regular-fit T-shirts
  • S: approximately 85–91 cm
  • M: approximately 91–96 cm
  • L: approximately 96–104 cm
  • XL: approximately 104–112 cm

These measurements vary by style. So don’t compare a regular-fit T-shirt with a loose-fit vest top without checking first. Measure your bust at its fullest point and compare it with the product page.

Care and lifespan

Wash sportswear inside out and with similar colours. According to the product information for the selected Under Armour styles, washing in cold water and tumble-drying at a low temperature are recommended. Avoid fabric conditioner if the care label advises against it, as it can affect the properties of technical fibres.

The Joma Short Sleeve T-Shirt Blue S is listed as suitable for washing at a maximum of 30 °C. According to the product description, it has short sleeves, a classic cut and lightweight, breathable fabric. Consumers in the Netherlands are also covered by the statutory guarantee; this product is listed with a minimum statutory guarantee of two years.

Our recommendations for different needs

Suitable for: Beginners on a budget
Joma Short Sleeve T-Shirt Blue S

Joma Short Sleeve T-Shirt Blue S

Why it suits this profile: This blue top works well as a first women’s sports T-shirt for light workouts, everyday wear or as an extra layer. Its classic cut is easy to style.

How this product avoids the pitfall

The product description specifies lightweight, breathable fabric, short sleeves and a classic fit. Just check that size S is right for your measurements.

Key benefit & highlights

Short sleeves, blue colour, classic cut and washing instructions for 30 °C.

Suitable for: Shoppers looking for top quality
Under Armour Women's T-Shirt Short Sleeve Black Sportstyle Collection L

Under Armour Women's T-Shirt Short Sleeve Black Sportstyle Collection L

Why it suits this profile: This black T-shirt is a good choice if you’re looking for one versatile style for training, fitness and casual wear.

How this product avoids the pitfall

According to the product information, the fabric is 100% polyester and the style has a loose fit. So you don’t have to rely on a general brand claim alone: the fabric and fit are clearly stated.

Key benefit & highlights

UA Tech fabric according to the product information, quick-drying material and at least 90% recycled polyester in the main fabric.

Suitable for: Specific uses & intense training
Under Armour Women's Tech Knockout Tank Black Sportstyle Collection S

Under Armour Women's Tech Knockout Tank Black Sportstyle Collection S

Why it suits this profile: The racerback and stretch fabric are well suited to workouts with lots of arm and shoulder movement, such as circuit training or fitness sessions.

How this product avoids the pitfall

The description specifies four-way stretch, a regular fit and a bust measurement guide. This makes it easier to judge the freedom of movement and fit before you buy.

Key benefit & highlights

90% polyester and 10% elastane according to the product information, a racerback design, and stated moisture-wicking and quick-drying properties.

Suitable for: Relaxing and casual sportswear
Under Armour Women's Rival Fleece Short Black Sportstyle Collection S

Under Armour Women's Rival Fleece Short Black Sportstyle Collection S

Why it suits this profile: These black sports shorts are designed for relaxing, casual wear and light activities where warmth and freedom of movement matter more than maximum ventilation.

How this product avoids the pitfall

The description specifies a loose fit, an elasticated waistband with a drawcord and open pockets. This makes the key details clear before you buy.

Key benefit & highlights

80% cotton and 20% polyester according to the product information, a brushed inner lining, drawcord and hand pockets.

Looking for more options?

We’ve put together a complete, up-to-date list of products that meet these strict selection criteria and the applicable European safety regulations.

Frequently asked questions about Under Armour women’s sportswear

Is Under Armour women’s clothing suitable for fitness?

It depends on the style. According to the product description, a polyester sports T-shirt or a women’s vest top with elastane may be suitable for workouts and training. Check the fit, stretch and size guide before ordering. A cotton style can be comfortable, but it isn’t always the best choice for an intense workout.

What size women’s sportswear should I choose?

Measure your bust for T-shirts and vest tops. For sports shorts, measure your waist and hips. Compare your measurements with the guide on the product page, as XS, S, M, L and XL can fit differently from one style to another. Check the difference between regular fit and loose fit, too.

How should I care for quick-drying sportswear?

Follow the care label for the specific garment. The Under Armour styles mentioned here are listed as suitable for cold washing, washing inside out and tumble-drying at a low temperature. Don’t use fabric conditioner if the product information advises against it, and don’t iron technical sportswear without checking the care label.