Joybuy Insights

Choosing swimwear and underwear: practical buying tips for women and men

A black bikini that loses its shape after just a few swims, or a pair of swim shorts that feel heavy and uncomfortable once you’re out of the water – these are all too common shopping mistakes. When it comes to swimwear and underwear, the choice isn’t just about colour or brand. Fit, fabric, fastenings and care all determine how suitable a product is for the beach, the pool, sport or everyday wear.

Watch out for three common pitfalls:

  • An attractive cut without enough adjustability: straps or a waistband that can’t be properly adjusted can limit the fit.
  • Marketing claims about fabric without a clear composition: terms like “quick-drying” don’t tell you much if the fibres and care instructions aren’t listed.
  • Choosing the wrong size: a bikini in size XS, M or L, and men’s underwear, can fit differently depending on the style. Always check the size guide and your waist or body measurements.

What to look for in swimwear and underwear

1. Check the fabric and function

For swimwear, polyester is a commonly used material. The Reebok swim shorts in this selection have an outer fabric and lining made from 100% polyester, according to the product description. The product information states that the fabric is lightweight, breathable and quick-drying. That can be handy when you’re heading home, to a café or on to another activity after swimming.

A brand’s claim about a material isn’t a universal guarantee. So treat “quick-drying swim shorts” as a product specification from the description, not a promise that the shorts will dry equally fast in every situation. Drying time also depends on wind, temperature, humidity and how much water the fabric has absorbed.

For underwear, cotton can feel comfortable for everyday wear. The Lee Sports trunks are made from soft cotton, according to the product description, and have an elasticated waistband. Reebok trunks are described as suitable for daily wear, sport and an active lifestyle. Always check the current composition and care label on each item.

2. Look at the fit, not just the size

If you’re searching for a ladies bikini black or black bikini for women, pay attention to how the top fastens. The Urban Classics bikini has a halter-neck style with crossed straps that tie at the back. This gives you more scope to adjust the fit than a completely fixed style.

The top is described in the product description as having a push-up effect. This is a design feature of the garment, not a medical or body-shaping claim. The bottoms have a sporty, relatively narrow cut. If you prefer more coverage, it’s a good idea to study the product images and description carefully.

For men’s underwear, waist measurement is a more important starting point than just the letter size. For the Lee Sports trunks mentioned, the following size information is provided:

  • XS: waist 62–67 cm
  • S: waist 70–75 cm
  • M: waist 76–81 cm
  • L: waist 82–87 cm
  • XL: waist 88–93 cm

Exact sizing can vary by brand and style. So don’t choose a bikini size XS M L based solely on your previous clothing size.

3. Pay attention to fastenings, movement and care

A swim short with a drawstring gives you extra adjustability around the waist. The Reebok Yestin and Yale models have an elasticated waistband with an internal drawstring, according to the product description. That’s practical for swimming, walking along the beach or moving during pool training.

Also check the care instructions. The Reebok swim shorts are machine washable at 30 °C according to the label, but should not be tumble dried, ironed or dry cleaned. The Lee Sports trunks are machine washable; here too, it’s recommended to follow the product label and avoid bleaching or tumble drying.

Good care won’t automatically prevent wear and tear, but it does help to preserve the fit and appearance for longer. After use in chlorinated or sea water, rinse your swimwear in clean water and leave it to air dry.

Recommended choices by use case

Suitable for: Budget-conscious beginners
Ladies Bikini black XS

Ladies Bikini black XS

Why this fits the profile: A black two-piece bikini for adult women looking for an easy-to-style model in size XS for the beach or pool.

How this product avoids the pitfall

The crossed halter straps can be tied at the back. Do check whether the relatively narrow cut of the bottoms suits your preferred level of coverage.

Key benefit & highlights

Black colour, lightly ribbed texture, halter-neck style and, according to the product description, a push-up effect.

Suitable for: Shoppers looking for top quality
Reebok RBK SPORTS TRUNKS

Reebok RBK SPORTS TRUNKS MED ANSELM-VECTOR BLUE/NAVY/TWILIGHT BLUE-L

Why this fits the profile: For men looking for everyday underwear with a sporty cut and multiple pairs in one purchase.

How this product avoids the pitfall

The product description includes material and care information. Check the label and size before ordering.

Key benefit & highlights

3-pack, flexible waistband and, according to the product description, a soft, breathable feel.

Suitable for: Specific use & intensive users
Mens Reebok Swimshort Yestin Humble Blue M

Mens Reebok Swimshort Yestin Humble Blue M

Why this fits the profile: A pair of Reebok men’s swim shorts for swimming, pool training and beach use in size M.

How this product avoids the pitfall

The elasticated waistband and drawstring offer two ways to adjust the fit. The description also states 100% polyester.

Key benefit & highlights

Blue colour, lightweight fabric, breathable construction and, according to the product description, quick-drying properties.

Looking for more options?

We’ve put together a full, up-to-date list of products that fully meet these strict selection criteria and comply with current European safety regulations.

Frequently asked questions about swimwear and underwear

How do I choose the right size for a bikini or swim shorts?

Measure your waist at the point where the waistband will sit and compare it with the size guide for the specific product. With a bikini, also look at the fit of the top and how adjustable the straps are. Your previous clothing size is only a guide.

What’s the difference between swim shorts and ordinary shorts?

Swim shorts are usually made from a fabric suitable for water, such as polyester, and often have a lining, elasticated waistband or drawstring. Ordinary cotton shorts can become heavy when wet and aren’t always designed for swimming.

How should I care for swimwear and men’s underwear?

Follow the care label. For the Reebok swim shorts mentioned, that means machine washing at 30 °C, no bleaching, no ironing and no tumble drying. Rinse your swimwear after use and leave it to air dry. This helps to reduce unnecessary strain on the colour, fibres and elastic.