Joybuy Insights

Buying underwear: how to choose a comfortable, well-fitting option

Buying underwear seems simple, until briefs ride up, a waistband digs in or the fabric loses its shape after just a few washes. Online, you also often see terms such as “antibacterial”, “seamless” and “extra breathable” without any clear explanation. That is why the product description and size chart matter more than a striking marketing claim.

Whether you are looking for women’s underwear, men’s underwear, an underwear multipack, a comfortable bra or women’s shapewear, focus particularly on the material, fit and intended use.

Common pitfalls when buying underwear

1. Looking only at the lettered size

An L is not the same for every brand. Always check the stated waist, hip or body measurements. For some products, the size refers to body height and measurements; for others, it follows the standard S to XL scale.

A size that is too small can dig in and wear out more quickly. A size that is too loose can shift, crease or provide insufficient support. If you are between sizes, follow the specific sizing advice on the product page.

2. Confusing material names with proven properties

Cotton can feel soft and breathable, but the exact level of comfort also depends on the weave, thickness and amount of elastane. Modal often feels smooth and flexible. A synthetic blend may be useful for stretch or a smooth finish.

Words such as “antibacterial”, “hypoallergenic” or “extra breathable” should be read as product claims. According to Utree’s product description, for example, certain models contain a gusset made with “10A antibacterial cotton”. This is a statement from the manufacturer, not a general guarantee regarding performance or skin comfort. Also check the complete fibre composition and care instructions.

3. Failing to match the style to the situation

A thong can be discreet under close-fitting trousers, while high-waisted briefs offer more coverage. Men’s boxer shorts are practical for everyday wear, but the leg length and waistband determine whether they stay in place while you move. For travelling, disposable underwear or disposable period products can be useful, but they are designed for single use and should not be flushed down the toilet.

The key points to check

Material and fibre composition

Read the material percentages rather than just the name on the packaging. For everyday use, cotton underwear and cotton blends are popular choices because they feel soft. Elastane provides stretch and helps the garment recover its shape. Modal can offer a smoother feel.

If in doubt, check:

  • The percentage of cotton, modal, nylon, elastane or other fibres.
  • Whether the gusset or lining is made from a different material.
  • Whether the product is machine washable.
  • Whether it can be tumble dried.
  • Whether the fabric is suitable for your intended use, such as everyday wear, travelling or light exercise.

Follow the care label. A product that should not be tumble dried may lose its shape more quickly if you dry it at a high temperature regardless.

Fit, rise and seams

Pay attention to descriptions such as mid-waist, high-waist, low-rise, “full coverage” or “seamless”. These tell you more about the fit than a product photo alone. Also check whether the leg openings are elasticated and whether the waistband is wide or narrow.

With seamless underwear, less visible edging is a practical advantage under thin clothing. This does not automatically mean that the style will be comfortable for everyone: the right size and sufficient support remain essential.

Packaging and cost per item

A multipack may seem like good value, but compare the price per item. A pack of three pairs of briefs or boxer shorts is convenient for a regular laundry routine. For temporary use, a smaller pack may make more sense.

With disposable underwear, also check:

  • The number of items in the pack.
  • The available sizes.
  • How it is opened and removed.
  • The instruction not to flush the product.
  • Whether it is regular disposable underwear or disposable period underwear.

Our recommendations by user profile

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

Utree Women's Pure Cotton Antibacterial Briefs, 3-pack

Why it suits this profile: The pack of three is practical for everyday use. The product description states that it features cotton, a 16 cm extended gusset and size L for 165/95.

How this product avoids the pitfall

The product information mentions a 3D fit and extra coverage. Check the size chart before ordering; the stated “10A” feature is a manufacturer’s claim.

Key benefit & advantages

3-pack, cotton material according to the product description and an extended gusset.

Suitable for: Shoppers looking for premium quality
Calvin Klein Relaxed Fit men’s trunks, 3-pack

Calvin Klein Relaxed Fit Trunk 3-Pack UB1 Black Men S

Why it suits this profile: These men’s boxer shorts are designed for everyday wear and come as a set of three. The product description states that they feature cotton, 5% elastane and an elasticated waistband.

How this product avoids the pitfall

The composition and sizing advice are provided. Follow the care label and avoid tumble drying, as stated in the product information.

Key benefit & advantages

3-pack, cotton blend and black as an easy-to-coordinate colour.

Suitable for: Specific needs & intensive use
C&S Dolemi disposable period underwear with side fastening

C&S Dolemi “Mao”Ning Side-Tab Disposable Period Underwear, M-L, 8 pieces

Why it suits this profile: This style is designed for single use during menstruation or when washing is not practical. The side fastening makes it easier to put on and take off.

How this product avoids the pitfall

The pack contains 8 pieces and is available in size M-L. It is disposable underwear, so it is not intended to replace washable everyday underwear.

Key benefit & advantages

8 pieces, side fastening and designed for menstrual use according to the product description.

Suitable for: Support under everyday clothing
Utree seamless comfortable wire-free bra

Utree Small-Busted Wire-Free Comfort Bra, M

Why it suits this profile: According to the product description, this comfortable bra has fixed cups, wide side panels and a seamless design. It is suited to anyone who wants fewer visible edges under tops.

How this product avoids the pitfall

Check the combination of bust measurement and height. The stated support is based on Utree’s product description and may vary from one body shape to another.

Key benefit & advantages

Wire-free, machine washable according to the product information and designed with wide side panels.

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 buying underwear

How do I choose my size when buying underwear online?

Measure your waist and hips with a flexible tape measure, without pulling it tight. Compare the results with the size chart for the specific product. For bras, also check the band and cup sizes. The sizing of a brand such as Calvin Klein may differ from that of another brand.

How long does everyday underwear last?

This depends on how often it is worn, the material, the fit and how it is washed. Having several sets in a multipack reduces wear on each individual item. Replace underwear when the fabric becomes thin, the elastic no longer springs back, seams start to come undone or the fit changes permanently.

What is practical for travelling or a heavy period day?

For travelling, camping or situations without washing facilities, disposable underwear can be practical. Disposable period underwear and overnight styles are available for menstrual use. Always check the size, number of pieces and disposal instructions. Do not flush disposable products down the toilet.