Joybuy Insights

Buying underwear: how to choose comfortable, well-fitting and practical underwear

You buy underwear regularly, but a low price or eye-catching product claim says little about everyday comfort. A waistband may stretch after a few washes, a style may show through your clothes or a fabric may feel less comfortable than you expected. Use these checks to compare women’s and men’s underwear based on the features that matter in everyday use.

Common pitfalls when buying underwear

1. Looking only at fabric names

Words such as modal, cotton, polyamide and elastane give you an initial impression, but they don’t tell the whole story. The proportion of each fibre also affects how stretchy and durable the underwear is, and how much care it needs. The cut, seams and waistband finish also influence comfort.

Cotton underwear can feel comfortable and absorb moisture, but it doesn’t always dry quickly. Synthetic fibres, on the other hand, can be lightweight and stretchy. So always check the full fabric composition, not just the front of the packaging.

2. Expecting sizes to be universal

Sizes vary by brand, style and country. A size M in women’s briefs may not fit the same as a size M in seamless underwear. Check the size guide, waist and hip measurements, and any height guidance. A waistband that’s too tight can dig in; briefs that are too loose may shift when you walk or exercise.

3. Confusing marketing claims with guaranteed performance

A brand may describe a product as “antibacterial”, “leakproof”, “shaping” or “extra breathable”. Assess these terms by looking at specific details: fabric, construction, fastening, thickness, fit and care instructions. For example, Utree’s product description states that the gusset contains 10A antibacterial cotton. This is a claim from the product information, not a medical guarantee.

With period underwear and disposable underwear, it’s important to check the intended use, size, absorbency or protection information, and when the product should be changed. Don’t treat general marketing language as a substitute for the manufacturer’s instructions.

Specifications worth checking

Fit and style

Choose a style based on your clothes and activities:

  • Women’s briefs with a higher waist offer more coverage and are often a practical choice under everyday clothes.
  • Seamless underwear may be less visible under close-fitting trousers or dresses. Check the fabric composition and how sturdy the edges are.
  • Men’s boxers and trunks come in different leg lengths and offer varying levels of support. For cycling, fitness or running, a style that stays in place matters more than a soft feel alone.
  • Shapewear usually has a firmer construction. Check the stated compression level: “light shaping” isn’t the same as firm control.

Fabric and stretch

Check the percentage of elastane or another stretch fibre. More stretch can feel comfortable when you’re moving, but a loose or thin waistband may lose its shape more quickly. With cotton underwear, it’s worth checking whether it’s 100% cotton or a blend containing elastane.

According to Utree’s product description, modal feels soft and silky. The same description states that it offers around 200% stretch and has an extended gusset measuring 16 centimetres. These are verifiable product specifications; the actual feel will still depend on the size, your body shape and your preferences.

Care and lifespan

Underwear is washed frequently, so check the following before you buy:

  1. The recommended washing temperature.
  2. Whether the product is suitable for tumble drying.
  3. Whether ironing, bleaching or dry cleaning is allowed.
  4. Whether it needs hand washing or must be air-dried.

Many Reebok styles in this selection are machine washable as directed, but must not be bleached or tumble-dried. According to the product information, the Feelingirl shaping briefs must be handled by hand, not machine washed, and left to air-dry. A style that needs a lot of care may not be the best choice if convenience is your priority.

Which option suits your needs?

Suitable for: Budget-conscious beginners
Utree modal women’s underwear 3-pack

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

Why it suits this profile: A 3-pack is practical for everyday changes. This style is designed as soft women’s briefs with full coverage and, according to the product description, is suitable for the office, home and light activity.

How this product avoids the pitfall

The product information lists size L as 165/95, an extended gusset measuring 16 cm and around 200% stretch. This gives you more specific details to assess the fit than the word modal alone.

Key benefit & highlights

3 pairs per pack; modal fabric; according to the product description, a gusset made with antibacterial cotton and compatible with sanitary pads.

Suitable for: Shoppers looking for top quality
Reebok Carina women’s underwear 3-pack

Reebok Briefs Carina Black/White/Grey Marl S

Why it suits this profile: According to the product information, this style combines 95% cotton with 5% elastane and is designed for everyday wear. It’s a good choice if you want a clearly stated fabric composition and a familiar 3-pack.

How this product avoids the pitfall

The fibre proportions are listed, along with instructions to wash at 30 °C and not to tumble-dry. This makes it easier to assess the fabric and care requirements before you buy.

Key benefit & highlights

95% cotton and 5% elastane; 3 colours; machine washable according to the stated instructions.

Suitable for: Specific needs & frequent users
Reebok RBK Sports Trunks men’s boxers 3-pack

Reebok RBK Sports Trunks MED Hinlo-Grey/White/Black-L

Why it suits this profile: According to the product description, these men’s boxers are designed for everyday wear, sport and an active lifestyle. The elasticated waistband is designed to stay in place as you move.

How this product avoids the pitfall

This choice is based on specific features: a 3-pack, flexible waistband and breathable, stretchy construction according to the product description, rather than just its sporty look.

Key benefit & highlights

3 pairs per pack; suitable for everyday activity and sport; machine washable according to the stated care instructions.

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 underwear

How often should you replace your underwear?

Replace underwear when the fabric becomes thin, the elasticated edge no longer fits snugly, seams come undone, or you notice lasting discolouration and wear. Its lifespan depends on how often it’s worn, the fabric, washing temperature and drying method. A multipack makes it easy to rotate between several pairs, so you don’t have to wash each one as often.

What underwear is suitable for sport?

Choose sports underwear with a fit that stays in place, an elasticated waistband and fabric that allows you to move freely. Seamless underwear can feel comfortable under sportswear, but check that the edges aren’t too tight. Follow the care label and avoid tumble drying if it isn’t permitted.

Is disposable underwear useful for travelling?

Disposable underwear can be practical for travelling, camping or situations where washing is difficult. Check the size, number of pairs and fabric description. For everyday wear, washable underwear is usually the more relevant comparison, as you’ll need to consider repeated use, waste and the cost per wear.