Joybuy Insights

Choosing underwear without regrets: pay attention to fit, material and intended use

Underwear may seem like a simple purchase, but small differences determine whether briefs, thongs or boxer shorts remain comfortable. A waistband that is too tight can dig in, seams may show beneath clothing and fabric that does not breathe sufficiently can quickly feel too warm. If you only look at colour, brand or discount, you will often discover these drawbacks after just a few wears.

This buying guide helps you compare women’s and men’s underwear based on verifiable product information. That way, you can choose comfortable underwear for everyday wear, sport, travel or during your period.

Three common underwear pitfalls

1. Choosing the wrong size by looking only at S, M or L

Sizes vary by brand and model. An M in men’s boxer shorts does not necessarily have the same waist measurement as an M in women’s briefs. Always check the size chart and, if necessary, measure your waist or hips. Pay attention to the cut too: a low-rise style sits lower on the hips, while briefs or high-coverage briefs offer more coverage.

2. Confusing marketing terms with measurable properties

Words such as “breathable”, “soft” or “antibacterial” only tell you something when the product description specifies the material and construction. For products with an antibacterial gusset finish, according to the brand’s product information, this may be linked to a specific treatment or material. This is not a medical claim and does not replace personal advice or good hygiene practices.

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

A 3-pack or 5-pack of underwear can be practical, but first check whether the colours, size and styles suit your wardrobe. A set in the same colour is useful for everyday wear; different colours may work better with light and dark clothing. Packs containing several items are often practical for travel, while buying a single style is useful when you want to try the fit first.

Which features are important?

Material: cotton, modal or synthetic fibres

Cotton underwear generally feels familiar and is often chosen for everyday wear. Always check the exact composition: “cotton” may be combined with elastane for stretch and shape retention.

Modal underwear is often described in product listings as having a smooth, supple feel. The Utree modal styles specify beechwood-based modal fabric combined with stretch properties. The feel can vary from person to person, especially if you are sensitive to warmth or tight edges.

Polyamide and elastane are often used in seamless underwear. These fabrics make a smooth, stretchy construction possible. This can feel comfortable beneath close-fitting clothing, but also check the care instructions and the proportion of synthetic fibres.

Fit and seams

For everyday wear, a soft waistband and a gusset that stays securely in place are important considerations. With thongs, the main priorities are minimal coverage and fewer visible lines beneath clothing. Briefs with fuller coverage provide more fabric around the hips.

For men’s underwear, boxer shorts and trunks offer a different balance between support and freedom of movement. Pay attention to the leg length, rise and whether there is a contoured pouch or fly. For sports underwear, it is important to have an elasticated waistband that does not roll over or shift during movement.

Care instructions and durability in use

Wash underwear according to the product label. Several selected styles specify washing at 30 °C and recommend not tumble-drying. Heat can put additional strain on elastane and elasticated waistbands. Use a mild detergent, avoid bleach when it is not permitted and check the seams after several washes.

A style needs replacing when the waistband no longer sits securely, the fabric becomes thin or the shape visibly changes. Its lifespan depends on how often it is worn, washed and dried, as well as on the material.

Our recommendations by user profile

Suitable for: Budget-conscious beginners
Utree 3-pack women’s cotton briefs

Utree - 2026 New Women's Pure Cotton Antibacterial Briefs with Extra Long Crotch - Nude Pink + Mist Purple + Oxygen Blue - 165/95 (L)

Why it suits this profile: These women’s briefs come in a 3-pack and are designed for everyday wear. The product information specifies cotton, a 16 cm extended gusset and size L for 165/95.

How this product avoids the pitfall

The size, pack size and construction are clearly specified. According to Utree’s product information, the gusset has a 10A antibacterial finish; this is a brand statement about the product, not a medical guarantee.

Main benefit & highlights

3 pieces, cotton material, extended gusset and a 3D cut according to the product description.

Suitable for: Buyers looking for top quality
Calvin Klein 3-pack slim boxers

Calvin Klein 3-Pack Slim Boxers - Icon Cotton Stretch - Black, White, Grey M

Why it suits this profile: These men’s boxer shorts combine a cotton-stretch blend with a slim fit. The set includes black, white and grey, making it suitable for a varied everyday wardrobe.

How this product avoids the pitfall

The composition includes cotton and elastane, and the product page provides size guidance. Even so, check your own waist measurement and the label, as “slim fit” may feel different from standard boxer shorts.

Main benefit & highlights

3-pack, cotton stretch, seamless Infinity Bond waistband according to the product information and a functional button-free fly.

Suitable for: Specific uses & intensive users
Reebok sports trunks 3-pack

REEBOK SPORTS TRUNKS MED FINLO-BLACK/WHITE/GREY-M

Why it suits this profile: According to the product description, the Reebok trunks are designed for everyday wear, sport and an active lifestyle. The flexible waistband is intended to provide support without feeling too tight.

How this product avoids the pitfall

The product description mentions a breathable, flexible construction and a supportive waistband. For intensive training, always check the personal fit and care label.

Main benefit & highlights

Practical 3-pack, flexible waistband and stated suitability for everyday wear and sport.

Extra options for specific preferences

  • Seamless underwear: LEE Seamless Brief styles are designed to create a smooth line beneath clothing. The product information specifies a stretchy waistband and washing at 30 °C. For example, take a look at the LEE Seamless Brief Alice.
  • Thongs: The Calvin Klein 3-Pack Thongs contains three thongs made from a cotton-elastane blend. This option suits anyone looking for minimal coverage and fewer visible lines.
  • Modal and extra stretch: The Utree modal triangle underwear in size L specifies an extended gusset, high stretch and a 3-pack.
  • Larger supply: A 5-pack of underwear, such as the Reebok Sports Trunks Baird, can be useful if you want to do laundry less often or travel frequently.

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.

Frequently asked questions about underwear

How do I know which underwear size I need?

Measure your waist and hips according to the method specified in the brand’s size chart. Compare the measurements in centimetres with the product page and consider the fit too. If you are between two sizes, a roomier style may feel more comfortable for everyday wear, while sports underwear usually needs to fit snugly without digging in.

How long does underwear typically last?

This depends on the material, how often it is worn and how it is cared for. Check the stretch in the waistband, thin areas and any lasting distortion. Washing according to the label, avoiding excessively hot drying and rotating between enough different items can help the underwear retain its shape for longer.

Is cotton or seamless underwear better?

It depends on how you intend to use it. Cotton is often chosen for a familiar, soft feel in everyday wear. Seamless underwear can be more practical beneath tight-fitting clothing thanks to its smooth construction. Rather than looking only at the material name, compare the fibre composition, fit, seams and care instructions.