Joybuy Insights

Choosing men’s underwear: how to find the right fit, fabric and multipack

Good men’s underwear should stay in place all day without digging in, rolling up or showing through your clothes. Yet the choice is often based on the brand name, colour or an attractive price. That can lead to disappointing purchases: a waistband that loses its shape after just a few washes, cotton that feels too warm during exercise, or a fit that does not work with your everyday clothing.

With these practical selection criteria, you can compare men’s boxers, men’s trunks and multipacks based on the features that really matter in the UK.

Common pitfalls when choosing men’s underwear

1. Looking only at the size letter

A size M is not the same for every brand. One manufacturer may link M to a specific waist measurement, while another uses EU or international sizes. Slim fit, relaxed fit and low-rise styles may also fit differently.

Measure your waist where the waistband normally sits, then check the size guide on the product page. Extra care is important when choosing larger sizes: some collections go up to 3XL, while other styles are only available up to XL.

2. Assuming all cotton is the same fabric

Men’s cotton underwear can be made from 100% cotton, but it may also contain a cotton blend with elastane or polyester. A small amount of elastane can improve freedom of movement and help the garment retain its shape. A style with more synthetic fibres may dry faster, but it may feel different from pure cotton.

Always check the material composition, fabric weight and care instructions. The product description is more important here than general advertising claims about softness or breathability.

3. Choosing a multipack without planning how you will use it

A men’s underwear multipack may seem like good value, but first check how many pairs you actually need and whether all the colours will work with your clothes. A five-pack of identical black boxers is practical for everyday wear, while a three-pack in black, white and grey offers more variety.

Also check the washing instructions. If the garments cannot be tumble dried, drying times and care requirements may be different from what you expect.

The most important specifications when choosing men’s underwear

Fit: boxer shorts or trunks?

Men’s boxers generally have longer legs and provide more coverage on the upper thigh. This can be comfortable under loose-fitting trousers or for everyday wear. Men’s trunks are shorter and often have a close-fitting shape. They work well under slim-fit jeans, trousers or sportswear, provided the legs do not ride up.

Look out for these terms:

  • Slim fit: fits closely around the hips and legs.
  • Relaxed fit: offers more room and feels less restrictive.
  • Low rise: sits lower on the hips.
  • Regular waist: sits around the natural waist.
  • Elasticated waistband: should stay securely in place without digging into your skin.

Fabric and stretch

Cotton and cotton blends are popular choices for everyday men’s underwear. According to the product descriptions, cotton feels soft and breathable. Elastane provides stretch and can help the garment retain its shape.

One example is the Urban Classics Solid Organic Cotton Boxer Shorts 5-Pack: according to the product information, the fabric consists of 95% organic cotton and 5% elastane. The description also states that the cotton is certified organic. Always check the current product specifications and label before buying.

Calvin Klein Icon Cotton Stretch is described as having a cotton-stretch blend. The product information also mentions a plant-based moisture-wicking finish; this is a claim made by Calvin Klein and should not be taken as a guaranteed result for every wearer.

Care and durability

How you wash your men’s underwear affects its fit and elasticity. Therefore, check:

  • maximum washing temperature;
  • whether tumble drying is permitted;
  • whether bleach is discouraged;
  • the appropriate ironing temperature;
  • whether dark colours should be washed separately.

Many styles in this selection are machine washable, but several product descriptions recommend washing at a low temperature and avoiding the tumble dryer. Always follow the care label, as composition and finishes can vary from one style to another.

Our recommendations by user profile

Suitable for: Budget-conscious beginners
Urban Classics Solid Organic Cotton Boxer Shorts 5-Pack

Urban Classics Solid Organic Cotton Boxer Shorts 5-Pack

Why it suits this profile: A five-pack gives you several pairs for everyday rotation. The product information states that it contains 95% organic cotton and 5% elastane, with a slim fit.

How this product avoids the pitfall

The composition and care instructions are clearly stated. This means you can compare the fabric and care requirements instead of looking only at the brand or price.

Key benefit & advantages

Five pairs per pack, organic cotton according to the product information, and elastane for stretch.

Suitable for: Shoppers looking for top quality
Calvin Klein 3-Pack Slim Boxers Icon Cotton Stretch

Calvin Klein 3-Pack Slim Boxers - Icon Cotton Stretch

Why it suits this profile: This style is designed for a close fit and comes in black, white and grey. That makes it suitable for work, leisure and a range of clothing styles.

How this product avoids the pitfall

The pack states that it has a cotton-stretch blend and a slim fit. Be sure to check your waist size, as a close-fitting style can feel smaller than a relaxed fit.

Key benefit & advantages

Three colours per pack, cotton with elastane, and a waistband designed for flexibility according to the product information.

Suitable for: Specific uses & intensive users
Reebok RBK Sports Trunks Baird

Reebok RBK Sports Trunks Baird

Why it suits this profile: The product description positions these trunks for everyday wear, sport and an active lifestyle. The pack contains five pairs.

How this product avoids the pitfall

The elasticated waistband and movement-focused fit are clearly highlighted. This allows you to compare the style specifically with standard everyday trunks.

Key benefit & advantages

Five pairs per pack, a flexible waistband and a profile suited to everyday wear and sport.

Looking for more options?

We have compiled a complete, up-to-date list of products that fully meet these strict selection criteria and the applicable European safety regulations.

Calvin Klein, Lee or Reebok: which brand is right for you?

Those looking for Calvin Klein men’s underwear often focus on a recognisable waistband, a close fit and classic colours. According to the product information, the Calvin Klein Relaxed Fit Trunk 3P is made from cotton with elastane and is available as a black three-pack.

Lee men’s trunks are worth considering if you want to buy several pairs at once. The Lee Trunk Innes is described as a low-rise five-pack made from 57% cotton, 38% polyester and 5% elastane. This fabric blend is therefore different from pure cotton underwear.

For sport and intensive movement, you can also compare Reebok men’s trunks. With these styles, pay particular attention to the fit around the leg, the elasticity of the waistband and the care instructions. A product description that mentions “sport” is no guarantee that the style will suit every sport or body shape.

Frequently asked questions about men’s underwear

How much men’s underwear do I need?

That depends on how often you do your washing and how many days a week you want to wear a clean pair. For everyday use, many men choose to keep around seven to ten pairs. A multipack makes it easy to top up your supply, but check the size, composition and colour first.

Are cotton boxers suitable for sport?

Cotton boxers can feel comfortable, but their suitability depends on the fabric blend, fit and personal preference. For sport, freedom of movement, a secure waistband and legs that do not ride up are important. So check the product specifications rather than relying on the material name alone.

How can I stop my boxers from losing their shape quickly?

Wash them according to the label, do not use bleach if it is discouraged, and avoid the tumble dryer when the manufacturer recommends this. Choosing the right size also helps: underwear that is too tight puts unnecessary strain on the seams and waistband. Check the current care instructions on the product page each time you buy.