Joybuy Insights

Buying underwear online: how to choose comfortable, breathable underwear that fits

Buying underwear online may seem straightforward, but a good-looking photo and a familiar brand name do not tell you everything about comfort. The wrong size, a waistband that is too tight or a material that does not wick away enough moisture can leave your purchase unused in the drawer.

Pay particular attention to these common pitfalls:

  • A general size with no clear size guide: sizes vary by brand, model and fit. An L from one brand may fit differently from an L from another.
  • Marketing claims without technical details: terms such as “breathable”, “premium” or “antibacterial” are only useful when the fabric composition, construction and care instructions are also clearly stated.
  • Choosing a multipack without checking the cut: a 3-pack of boxer shorts is practical, but only if the length, waistband and leg openings suit your everyday needs.

What should you look for when buying underwear online?

1. Material and moisture management

For comfortable everyday underwear, the fabric is an important starting point. Cotton feels soft and can absorb moisture. Many styles combine cotton with elastane, allowing the underwear to stretch and retain its shape more effectively. One example is the LEE BRIEFS LILIOP, which, according to the product information, contains 95% cotton and 5% elastane.

For sports underwear, you will often see a combination of cotton and synthetic fibres. According to the product specifications, the Reebok Sports Trunks JAY are made from 57% cotton, 38% polyester and 5% elastane. Polyester can help provide a lightweight, flexible feel during movement. Always check, however, whether “moisture-wicking” or “moisture-managing” is a specific product feature rather than just a general advertising claim.

If you are specifically looking for cotton underwear, breathable underwear or stretchy underwear, it is worth reading the full composition. A natural fibre does not automatically mean that every style is suitable for intense exercise, while synthetic fibres are not necessarily less comfortable.

2. Fit, waistband and freedom of movement

A good fit prevents underwear from slipping down, rolling up or riding up as you walk. So look at:

  • the rise;
  • the leg length of men’s boxer shorts;
  • the width and elasticity of the waistband;
  • the shape of the gusset or contoured pouch;
  • the leg openings and seams.

For women’s underwear, the cut and coverage are just as important. Women’s briefs generally offer more coverage than a women’s thong. A thong can be practical under close-fitting clothing, while briefs may be more suitable for many people as comfortable everyday underwear.

When ordering online, pay attention to your body measurements in centimetres, not just XS, S, M, L or XL. For example, the Utree styles use size indications such as M (160/90), L (165/95) and XL (170/100). These measurements should always be compared with the size guide on the product page.

3. Hygiene and “antibacterial” claims

Some women’s styles are marketed as antibacterial women’s underwear. Assess such descriptions carefully. According to Utree’s own product description, the relevant styles feature a gusset marked “10A antibacterial”. This is a brand or product claim; it is not a reason to regard any medical or hygienic effects as guaranteed.

Also look at practical details, such as:

  • the length and width of the gusset;
  • whether the style is suitable for use with a pantyliner or menstrual product;
  • how the gusset is finished;
  • whether the material may be washed at 30 or 40 degrees according to the label.

A longer gusset construction can provide additional coverage, but actual comfort still depends on size, body shape and personal preference.

Recommended choices by user profile

Suitable for: Budget-conscious beginners
LEE BRIEFS LILIOP-DRAMA BLUE/LEMON STRIPE/GREY MARL-XS

LEE BRIEFS LILIOP-DRAMA BLUE/LEMON STRIPE/GREY MARL-XS

Why it suits this profile: This multipack is practical for anyone who wants to buy several pairs of everyday briefs at once and is looking for a soft, stretchy fit.

How this product avoids the pitfall

The product information states that this is a multipack made from cotton fabric with stretch. Be sure to check the available size and care label before buying.

Main benefit & key advantages

Soft cotton fabric, stretchy construction and several colours in one pack.

Suitable for: Shoppers looking for premium quality
Calvin Klein Boxer Brief 3PK W8O Black Glacier Blue Bell Men XS

Calvin Klein Boxer Brief 3PK W8O Black/Glacier/Blue Bell Men XS

Why it suits this profile: A great choice for anyone who values a recognisable branded waistband, a close-fitting boxer brief and a range of colours.

How this product avoids the pitfall

The product page mentions a shaped pouch, stretchy fabric and a fitted cut. Check that the close-fitting style suits your preference.

Main benefit & key advantages

3-pack, stretchy material, breathable product description and contoured pouch.

Suitable for: Specific needs & active users
Reebok RBK SPORTS TRUNKS MED DARIAN BLACK FLASH RED GREY BLUE WB M

Reebok RBK SPORTS TRUNKS MED DARIAN-BLACK/FLASH RED/GREY/BLUE WB-M

Why it suits this profile: The combination of a flexible waistband, freedom of movement and a 3-pack makes this suitable for sport, cycling, walking and everyday wear.

How this product avoids the pitfall

The product description mentions breathable, flexible material and support without constriction. Its performance has not been independently verified; follow the product specifications and judge the fit for yourself.

Main benefit & key advantages

Practical pack of 3, flexible waistband and a design made for everyday movement and sport.

Suitable for: Anyone looking for soft women’s underwear
Utree women’s modal triangle underwear 3-pack

Utree - 2026 New Women's Modal Triangle Underwear, Pure Cotton, Cotton Crotch, Antibacterial - Romantic Blue + Light Lilac Purple + Mint Green - 165/95 (L)

Why it suits this profile: This 3-pack is designed for anyone looking for soft fabric, extra coverage and plenty of stretch for the office, home or light activity.

How this product avoids the pitfall

According to Utree’s own product description, this style has an extended 16 cm gusset and approximately 2x stretch. The stated antibacterial property remains a brand claim.

Main benefit & key advantages

Soft-feel modal fabric, extended gusset, stretch and 3 colours in one pack.

Looking for more options?

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

Care plays a key role in product lifespan

Even well-fitting underwear can quickly lose its shape if washed incorrectly. Check the care label before every purchase. Many styles in this selection are machine washable, but advise against bleaching and tumble drying, and recommend ironing at a low temperature. The LEE styles state that they should be washed at 30 °C; some Reebok styles specify 40 °C.

Where possible, wash underwear at the lowest temperature stated on the label. Use a laundry bag for delicate styles and avoid using too much detergent. Replace an item when the elastic remains loose, the seams cause irritation or the fabric has become thin and misshapen. Its practical lifespan depends on how often it is worn, your washing routine, the material and the fit.

Frequently asked questions about buying underwear online

How do I work out my underwear size when shopping online?

Measure your waist or hips with a flexible tape measure and compare the result with the size guide for the specific product. Do not rely solely on your usual size, as brands and styles can fit differently.

Is a multipack better value than individual briefs or boxers?

A multipack can reduce the price per item and makes it easier to build up a supply for everyday wear. However, compare the total price, number of items, fabric composition and care instructions. A cheap pack is not a good deal if you do not like the fit.

What underwear is suitable for sport?

Choose sports underwear with a secure waistband, plenty of stretch and a cut that does not ride up. Product descriptions for sports styles sometimes mention breathable fabric or moisture management. Treat this as information provided by the brand, and also check that the composition and size suit your activity.