Joybuy Insights

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

Underwear may seem like a simple purchase, but you often only notice a poor choice once you start wearing it. A waistband that digs in, seams that show under clothing or fabric that loses its shape after a few washes can make a multipack less of a bargain than it first appears. This guide helps you compare women’s underwear, men’s underwear, bras and practical options for periods or travel, based on verifiable product information.

Common underwear pitfalls

1. Choosing a multipack without checking the fit

An underwear multipack is convenient for everyday use, but three or five pairs are only worthwhile if the size is right. Don’t just look at S, M, L, XL or 3XL. Check the waist and hip measurements in the size chart too. Stretch fabric may fit differently from a firm cotton style.

Some product listings offer a wide range of sizes, while the displayed chart does not show every size. For example, a Calvin Klein 3-pack of thongs mentions 3XL in the product name, but the size chart shown runs from XS to XL. Before ordering, check which sizes are actually available.

2. Confusing marketing claims with measurable features

Words such as “antibacterial”, “extra breathable” or “leakproof” may sound clear, but their meaning varies from one product to another. According to the product descriptions of various Utree styles, the gusset features what is described as a 10A antibacterial finish. This is a claim made in the brand’s product information, not a general guarantee of a particular performance.

Instead, look at practical details: fabric composition, cut, gusset length, stretch, waistband style and care instructions. This information is more useful for comparing products than an isolated marketing term.

3. Choosing a style that doesn’t suit your clothes or how you use it

Thongs may be less visible under close-fitting trousers or dresses, but they also provide less coverage. Women’s briefs with a higher waist offer more coverage. Seamless underwear often works well under lightweight fabrics, while classic briefs or men’s trunks may provide more structure and coverage.

For travel, postnatal recovery or a long day, disposable underwear can be practical. For everyday use, washable underwear is usually the more sensible option, as you can wear it again and better estimate the ongoing care costs.

What should you look for when comparing underwear?

Material and feel

Cotton is known as a widely used, breathable material for everyday underwear. Always check whether the product is made entirely from cotton or is a cotton blend. For example, the Calvin Klein 3-pack of thongs lists 90% cotton and 10% elastane. Elastane provides stretch, but the ratio may vary between styles.

Modal, as used in certain Utree women’s styles, feels smooth and soft according to the product description. If you are mainly looking for a soft, flexible fabric, you can compare modal with cotton underwear. Do check the care label, though, as softer blends may have different washing requirements.

Fit, seams and coverage

When checking women’s underwear, look at:

  • the waist height;
  • the width of the sides;
  • the finish around the leg openings;
  • whether it has a fully lined gusset;
  • the amount of stretch;
  • whether the cut is suitable for sanitary pads.

With men’s underwear, the main difference between briefs, boxers and men’s trunks is the leg length and level of coverage. A relaxed-fit trunk can be a practical middle ground between classic briefs and longer boxers.

Care and lifespan

Washable underwear will generally remain usable for longer when you follow the care label. Some Calvin Klein styles can be machine-washed, while other styles advise against using a tumble dryer. Drying at a low temperature or air-drying can help reduce stress on the elastic and maintain the fit.

Disposable underwear and period underwear require a different approach. Disposable underwear is designed for single use. With period pants, you should check how the product needs to be washed and dried, how many pairs you will need and whether the size is suitable for your hip measurement. Treat absorbency claims as information supplied by the brand and follow the usage instructions.

Our recommendations for different uses

Suitable for: Budget-conscious beginners
Calvin Klein - 3 Pack Bikini Briefs - Icon Logo - Black, Grey, White 3XL

Calvin Klein - 3 Pack Bikini Briefs - Icon Logo - Black, Grey, White 3XL

Why it suits this profile: A set of three in black, grey and white is a practical way to build up a first supply of women’s underwear. The bikini cut is suitable for everyday use, and the cotton blend contains 10% elastane.

How this product avoids the pitfall

The product information states that it has a fully lined gusset and a cotton-elastane blend. Do check the size chart, as the product name mentions 3XL while the displayed chart does not show every size.

Key benefit & highlights

3-pack, cotton blend, mid-rise waist and three neutral colours.

Suitable for: Shoppers looking for premium quality
Calvin Klein Relaxed Fit Trunk 3P. UB1 Black Men L

Calvin Klein Relaxed Fit Trunk 3P. UB1 Black Men L

Why it suits this profile: Men looking for a recognisable brand, a black colour and a set for everyday use get three trunks with an elasticated waistband and cotton, according to the product listing.

How this product avoids the pitfall

The cut and size are described more clearly than in many generic listings: relaxed fit, size L and machine washable. Check the label for the exact elastane content.

Key benefit & highlights

3-pack, black colour, elasticated waistband and a style designed for everyday wear.

Suitable for: Specific needs & intensive use
C&S Dolemi MaoNing Side-Tab Disposable Period Underwear for Women, Size M-L 8 Pcs

C&S Dolemi "Mao"Ning Side-Tab Disposable Period Underwear for Women, Size M-L (8 Pcs)

Why it suits this profile: This disposable option is designed for situations where you need to change quickly and don’t have to do any washing, such as travelling, overnight stays or postnatal recovery. The sides are tearable, according to the product description.

How this product avoids the pitfall

The pack of eight makes its intended use clear. Check the M-L size beforehand and dispose of each pair after use; it is not a replacement for washable period underwear.

Key benefit & highlights

8 pieces, side fastening, single use and suitable for situations without washing facilities.

Suitable for: Comfort-focused everyday wearers
Utree Small-Busted Women's Wire-Free Comfort Bra Seamless Invisible Skin L

Utree Small-Busted Women's Wire-Free Comfort Bra, Seamless, Invisible Skin L

Why it suits this profile: If you are looking for a comfortable wire-free bra, you can compare this style based on its moulded cups, wide side panels and seamless construction. According to the description, it is designed for everyday use and light exercise.

How this product avoids the pitfall

The product listing does not mention separate underwires and states that it is machine washable. Check whether the 160-165/90-95 size indication matches your measurements and whether the moulded cups suit your preferences.

Key benefit & highlights

Wire-free design, moulded cups, wide side panels and a seamless finish.

Looking for more options?

We’ve 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 often should you replace your underwear?

It depends on the material, how often you wear it, how it is washed and the condition of the elastic. Replace an item when the seams start to come undone, the waistband no longer fits snugly, the fabric becomes thin or the shape changes permanently. There is no fixed number of months that applies to every product.

Is cotton underwear always the right choice?

Cotton is a practical option for everyday use, but it is not automatically suitable for every situation. A cotton blend with elastane may offer more stretch. Modal may feel smoother. Compare the composition, fit and care instructions with your own preferences.

What is useful for travel or periods?

For travel without reliable access to washing facilities, disposable underwear can be practical. For regular use, you can compare period underwear or period pants based on size, care instructions, coverage and the manufacturer’s information about absorbency. If in doubt, choose a style with clear instructions and always check the fit before wearing it for an extended period.