Joybuy Insights

Sportswear and underwear for women and men: how to choose without regretting your purchase

Buying a new sports shirt, men’s boxers or women’s underwear seems straightforward. Yet many disappointing purchases come down to details that are barely visible in product photos. An elasticated waistband may feel less comfortable after a few washes, sports leggings may become see-through when you move, and “quick-drying swimwear” tells you little about how it will perform without information about the material.

Use this practical checklist to compare sportswear and underwear for women and men by fit, material, care and intended use. Then browse a selection of products to suit different shopping needs.

Three common pitfalls when shopping online

1. Marketing terms without verifiable specifications

Words such as “breathable”, “performance” and “comfortable” are only useful when there is also information about the material composition, fit and care. A polyester sports shirt may feel lightweight and wick away moisture, but that does not automatically mean it is suitable for every workout.

So check:

  • what percentage of cotton, polyester or elastane is used;
  • whether a specific fit is given, such as regular fit or high waist;
  • whether the features are based on the brand’s product description;
  • whether the information matches the care label.

Take extra care with branded technologies. According to Nike, Dri-FIT is designed to wick moisture away from the skin. Treat this as a product claim from the brand, and also check the fabric, construction and feedback on the fit.

2. Choosing a size based only on S, M, L or XL

Sizing varies by brand, product type and country. Men’s boxers with a firm waistband may fit differently from loose men’s swim shorts. For women’s underwear, hip measurements may be more important than waist measurements, while the length and stretch of women’s sports leggings also matter.

Measure yourself at home with a flexible tape measure:

  1. your waist, where the waistband normally sits;
  2. your hips, at the widest point;
  3. for leggings, the inside leg length if needed;
  4. for swim shorts or board shorts, the length and coverage you prefer.

Then check the size guide on the product page. “True to size” is a guide from the product information, not a guarantee that the same size will fit the same way across every brand.

3. Ignoring care instructions

A product may feel comfortable, but it can wear out sooner if it is washed or dried incorrectly. Some stretch fabrics should not be exposed to high heat. According to the product information, the Reebok Sports Trunks Jay-Black/Charcoal Marls/White-M can be machine-washed, but should not be tumble-dried. The Calvin Klein 3-Pack Strings should also not be tumble-dried, according to the description.

Before buying, check:

  • the maximum washing temperature;
  • whether it is suitable for tumble drying;
  • whether bleach can be used;
  • ironing instructions;
  • any special instructions for swimwear after exposure to chlorine or salt water.

Key considerations for sportswear and underwear

Material: choose according to the activity

Cotton generally feels soft and works well for everyday women’s underwear or men’s boxers. However, it can hold on to more moisture during intense exercise. Polyester is often used for men’s sports shirts and swimwear because it is lightweight. Elastane provides stretch and freedom of movement, but usually requires careful washing.

Examples from our selected products:

  • According to the product information, the Reebok Sports Trunks are made from 57% cotton, 38% polyester and 5% elastane.
  • The Nike Dri-FIT Park 20 Tee is described in the product information as a lightweight, breathable shirt. However, the available product specifications give different material compositions. Check the current product page and the label before use.
  • According to the description, the Under Armour Women’s Tech Hi Capri is made from 87% polyester and 13% elastane, with four-way stretch.

Fit: support without digging in

A waistband should stay in place without cutting into your skin. Flat seams can help reduce chafing on sports leggings or shirts, while a drawcord gives men’s swim shorts extra adjustability.

With Calvin Klein strings, the main consideration is how much coverage you prefer. The description specifies minimal coverage and a smooth fit under clothing. Calvin Klein strings may therefore work well under fitted trousers or dresses, but they are not the right everyday fit for everyone.

Swimwear: length, lining and intended use

For the beach, swimming pool and watersports, consider:

  • whether there is an inner brief or lining;
  • an adjustable waistband;
  • pockets, if you find them useful;
  • length, such as 5-inch or 7-inch board shorts;
  • the material and care instructions after exposure to chlorine or salt water.

Treat UPF 50+ as a brand or product claim. According to Willit’s product description, the women’s board shorts mentioned have this rating. In practice, the level of protection also depends on coverage, fit and correct use. Swimwear is not a substitute for general sun protection.

Our recommendations for different needs

Suitable for: Budget-conscious beginners
REEBOK SPORTS TRUNKS JAY-BLACKS/CHARCOAL MARLS/WHITE-M

REEBOK SPORTS TRUNKS JAY-BLACKS/CHARCOAL MARLS/WHITE-M

Why it suits this profile: These boxers are designed for everyday wear and combine cotton, polyester and elastane in one fabric. That makes them a practical choice for work, leisure and light exercise.

How this product avoids the pitfall

The product information mentions a flexible waistband, breathable fabric and a supportive fit. Be sure to check the size and follow the advice not to tumble-dry them.

Key benefits and features

57% cotton, 38% polyester and 5% elastane; machine-washable; available in various colours and sizes according to the product description.

Suitable for: Shoppers looking for premium quality
Calvin Klein 3-Pack Strings - Icon Logo - White 3XL

Calvin Klein 3-Pack Strings - Icon Logo - White 3XL

Why it suits this profile: A pack of three is a good choice if you want to buy several pairs of women’s underwear at once and are looking for a smooth look under fitted clothing.

How this product avoids the pitfall

The size guide includes waist and hip measurements. Use these rather than relying on the 3XL label alone. The product information also lists cotton and elastane for a stretchy fit.

Key benefits and features

Three pairs of strings per pack; 90% cotton and 10% elastane according to the description; iron at a low temperature and do not tumble-dry.

Suitable for: Specific activities and intensive use
Nike Dri-Fit Park 20 Tee CW6952-071 L

Nike Dri-Fit Park 20 Tee CW6952-071 L

Why it suits this profile: This men’s sports shirt is designed for football, training and casual wear. The regular fit and short sleeves allow you to move freely.

How this product avoids the pitfall

The description specifies a regular fit and machine-washable fabric. As the available material details do not seem to match fully, it is worth checking the current product specifications.

Key benefits and features

Short sleeves; crew neck; regular fit; according to Nike, the product information cites Nike Dri-FIT for moisture management.

Suitable for: Beach and pool days
Men's Reebok Swim Shorts Yestin Humble Blue XL

Men's Reebok Swim Shorts Yestin Humble Blue XL

Why it suits this profile: These men’s swim shorts are suitable for swimming, pool workouts and the beach. The elasticated waistband with an internal drawcord gives you extra adjustability.

How this product avoids the pitfall

The fit does not rely on an elasticated waistband alone: you can adjust the internal drawcord. The care information recommends washing at 30 °C and not tumble-drying.

Key benefits and features

100% polyester outer fabric and lining according to the description; elasticated waistband; internal drawcord; machine-washable at 30 °C.

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 sportswear and underwear

How often should you wash sportswear?

Wash sportswear after intensive use, especially if the garment has become visibly or noticeably damp. Always follow the care label. For technical fabrics, it is generally best to avoid fabric softener if the manufacturer advises against it, as it may affect the fibres’ properties.

How long do sports leggings or swim shorts last?

Their lifespan depends on how often they are worn, friction, sun, chlorine, salt water and care. Women’s sports leggings worn for regular training will take more wear than a pair used occasionally. Rinse swimwear with clean water after swimming and dry it according to the care instructions. Replace a garment when the seams, elastic or fabric visibly stop doing their job.

What should you look for when buying sportswear for several activities?

Start by choosing the main activity. For running or intense training, moisture management, freedom of movement and flat seams matter. For everyday wear, comfort often takes priority. For swimming, lining, an adjustable waistband, length and material are more important. This helps you avoid buying a garment based on a general claim when it does not suit the way you plan to use it.