Buying underwear seems simple, until a waistband digs in, fabric starts to pill or briefs show through your clothes. Online, you’ll also come across terms such as “seamless”, “breathable” and “shaping”, but these do not always tell you enough about the fit or care requirements.
This buying guide compares women’s and men’s underwear based on practical criteria. That makes it easier to find cotton underwear, men’s boxers, women’s briefs, women’s thongs, period underwear or comfortable undergarments that suit your everyday needs.
A size M is not the same for every brand. One waistband may fit snugly, while another style is more generous. Always check the size guide for the specific product. For women’s underwear, look at your waist and hip measurements; for men’s underwear, check the stated clothing size or waist measurement.
For example, the Calvin Klein thongs list separate waist and hip measurements. Some men’s boxers mainly use letter sizing. This makes choosing based on just “M” or “L” less reliable.
“Seamless” may mean that the edges are barely visible, but it does not necessarily mean that the entire garment is made without seams. “Breathable” also says nothing about the exact fibre composition. So check the material percentage, construction and care instructions.
A cotton blend with elastane can provide comfortable stretch, while modal feels soft against the skin. Synthetic fibres may be needed in women’s shapewear for elasticity, but they sometimes require hand washing. According to the Calvin Klein product description, one particular thong is made from 90% cotton and 10% elastane. That is a more verifiable starting point than a general comfort claim.
A 3-pack of underwear is practical if you already know that the fit and style suit you. If you are trying a particular brand or type for the first time, buying a single item may be the wiser choice. Consider the colours too: black, white and grey are easy to coordinate, while light fabrics can sometimes show through white clothing.
For travel or temporary use, disposable underwear can be convenient. Bear in mind the waste, the packaging and the fact that the product is thrown away after being worn once.
A product description containing terms such as “antibacterial” or “moisture-wicking” should be understood as a claim made by the brand or manufacturer. According to the brand’s own research, a particular treatment may support a certain function, but the product information is not a guarantee of an individual experience or medical effect.
Choose the style based on your clothing and activity:
Always follow the care label. Many styles can be machine washed, but some shapewear items are suitable for hand washing only. Several Calvin Klein styles recommend washing at a low temperature and advise against tumble drying. Incorrect drying can cause elastane and elastic bands to wear out more quickly.
Why it suits this profile: Three colours in one pack are handy for your everyday rotation. Sizes M, L and XL are linked to body height and size guidance; check this before ordering.
The product information specifies the material, stretch and a detailed fit. This allows you to compare more purposefully than by looking only at the colour or marketing name.
3-pack; modal as the main material according to the product description; high stretch and a style offering more coverage.
Why it suits this profile: For anyone looking for a recognisable brand, classic colours and a close fit for work and everyday wear.
The composition is described as cotton with elastane, while the fit is listed as slim. However, check the exact label, as the product page does not specify all material percentages.
3-pack in black, white and grey; slim fit; elasticated waistband and a functional fly without a button, according to the product description.
Why it suits this profile: Suitable for anyone who does not want to carry laundry during travel, a period or another temporary situation.
The pack contains eight disposable garments and uses side fastenings. This makes the style suitable for temporary, practical use rather than a regular everyday underwear rotation.
8 pieces per pack; adjustable side tabs; designed for single use and easy removal.
For everyday wear, women’s briefs, bikini briefs and cotton underwear are sensible choices if coverage and easy care are important to you. Women’s thongs are better suited to outfits where you want to minimise visible lines. A style such as the Calvin Klein 3-Pack Strings contains three pieces, a cotton blend and minimal coverage. Check the size details carefully: available sizes and measurements may vary from one product to another.
For men, you can choose between trunks and boxers. A relaxed-fit trunk generally offers more room than a slim style. If you are often on the move, look for a flexible waistband and legs that do not ride up easily. Care instructions are just as important as the material.
With women’s shapewear, the choice mainly depends on the level of support you want and the clothes you will wear over it. According to Feelingirl’s product description, the model in question is designed for light shaping and contains nylon and spandex. This does not provide a medical effect; comfort and fit remain personal. If you are unsure, choose a larger size when recommended by the size guide.
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.
Measure your waist and hips as indicated in the size guide. Then compare your measurements with the specific brand and style. If you are between sizes, check the fit description and any sizing advice on the product page.
That depends on the material, how often you wear it, detergent, temperature and drying. Elasticated bands can lose their shape more quickly when exposed to high temperatures or tumble drying. Rotate several sets and follow the care label to help maintain the fit for longer.
For everyday use, reusable underwear is generally more practical because you can wear it several times. Disposable underwear can be useful for travel, emergencies or situations where washing is difficult. So do not compare only the price per pack; also consider the number of wears and the amount of waste produced.