Guides / Underwear Guide

Underwear Guide

Welcome to Björn Borg's Ultimate Underwear Guide, your go-to resource for everything you need to know about premium underwear. Whether you're looking for comfort, style, or performance, our expertly crafted underwear collection has you covered.

In this comprehensive guide, we'll explore the essential factors to consider when choosing the perfect underwear, from fabric choices to fit tips. Join us on this journey to discover the ultimate in comfort and style, all while optimizing your search for the finest underwear options. Let's dive in!

How do you choose the right men's underwear? Boxer, trunks, or briefs? What is my size?

In this guide, we take you through the following:

Underwear models: Boxers, Trunks and Briefs.


The boxer model is a true classic that suits all body types, often with a medium waist and medium length legs. In this case, we are referring to the type of boxer briefs, which are a mix between traditional boxer shorts and trunks. They are tight in the waist and are slightly longer in the legs.

It is flexible underpants, not as revealing as briefs and which offers high support around the thighs. The added fabric between your legs also allows you to avoid chafing.

Nice stretch, perfect fit and maximum comfort are important features when it comes to boxers, and of course for all types of underpants. It is also important to choose the right size, as too big leads to extra fabric that bunches up, while too small can easily give you chafing and feel uncomfortable.


Trunks are a shorter version of boxer briefs and are a style that has grown in popularity. If you think that briefs are a little too short and revealing, but also don't want to have as long legs as boxers, then trunks are the perfect middle ground.

The fit is usually a slightly lower waist and shorter legs that reach just past the crotch area. Trunks also work very well if you have tight pants. Trunks are best worn by men who are a bit narrower across the thighs, those with larger thighs can often find that the pant legs on these ride up when you walk.

An additional advantage for guys with narrower legs is that trunks' tight and tight fit means that there is no excess fabric around the thighs.


Briefs, sometimes also called Y-front, are the shortest model of underpants, with full coverage at the back and with the upper part of the thigh and the side of the leg exposed.

They give you a lot of support and comfort, and are also an appreciated model if you have larger thighs. The design and cut of the briefs mean that they also work very well for those of you who often wear tight pants.

The high support and fit make these sporty underpants very suitable for cardio training, with maximum mobility and a comfortable feel.

Our Björn Borg briefs in cotton and elastane have a medium waist and short legs, plus a soft microfibre elastic.

Our Styles

Are you looking for a pair of underpants with a luxurious feel? Then you should take a closer look at Premium Cotton Stretch, comfortable underpants in long-fibre organic cotton, with flexible stretch and a perfect fit.

Premium Cotton Stretch (Core)

These premium briefs have a clean design, reinforced crotch and a soft microfiber elastic, with a classic Björn Borg logo printed on it.

Premium Cotton Stretch comes in the style boxers and is available both as plain colored underpants and with stylish patterns. The size is true to size, so choose the size you usually have.

Premium Cotton Stretch vs. Cotton Stretch

What is the difference between the Cotton Stretch and Premium Cotton Stretch models?

Cotton Stretch is a classic and comfortable everyday favorite in a mix of cotton and stretchy elastane, topped with a microfiber elastic, designed with iconic Björn Borg prints all around the elastic band. Cotton Stretch is available in all underwear styles, while the Premium Cotton Stretch option is available in boxers.

If you want more exclusive underpants with a more luxurious feel, then Premium Cotton Stretch is the ultimate choice. With its extra soft, long-fibre organic cotton and stylish premium design, it is an underpants choice for those who want that little something extra. The design of the elastic band with a simple but effective Björn Borg logo is another detail that contributes to a clean look.

Premium Cotton Stretch is available in a boxer model, with a medium waist and medium legs. This means that the cut of boxers in Cotton Stretch and Premium is the same. Something that differentiates the models, however, is that Premium Cotton Stretch also has a reinforced crotch, which gives the underpants a longer lifespan.

Cotton Stretch is a comfortable companion in your underwear drawer. They are underpants with a perfect fit, made of quality cotton and stretchy elastane and with a soft microfiber elastic. The material breathes and is also sustainably sourced.

Cotton Stretch (Essential)

Our Cotton Stretch briefs come in smart multipacks and with a wide range of colors and patterns, so you can find the right choice for you.

Cotton Stretch is available in all underpants models. Choose from boxers with a medium waist and medium legs, trunks with a lower waist and short legs, and briefs with a medium waist.

The size is true to size, so choose the size you usually have.

When you train, nothing should stand in your way. High comfort is of the utmost importance, both when it comes to training clothes and your underwear. That's why we've developed Performance Boxers, underpants with a close fit with soft stretchy elastic, smooth seams and breathable material.

Performance - Underwear for training

The material of the training underpants is recycled polyester and elastane. The fabric leads away moisture to keep you dry during the sweatiest workouts.

Performance is available in the boxer briefs model, both with medium and longer legs.

The size is true to size, so choose the size you usually have.

  • Underwear in wicking material

  • Tight supportive fit

  • Flat seams prevent abrasions

Lyocell is a wonderfully soft material made from sustainably produced wood pulp. The silky Lyocell material is both soft and cool, making the underwear incredibly comfortable to wear.

Underwear in Lyocell

Björn Borg's Lyocell underpants have TENCEL™ fibers that are biodegradable, flexible and durable. The combination with elastane gives you both high comfort, flexibility and material that breathes.

Our Lyocell underwear is available in the models boxers and trunks. The size is true to size, so choose

Underwear Materials

Underwear materials have the biggest impact on longevity, quality and comfort of your underwear. As such, it is important to take a closer look.


Cotton is the most common material when it comes to underwear. It is a natural fiber that is both soft and durable, which means that it lasts a long time and can withstand a lot of washing. Cotton underwear is both comfortable and has good breathability


Lyocell is a wonderfully soft and cool material that is made from sustainably produced wood pulp. Our Lyocell briefs are made from TENCEL™ fibres. It is a durable material with good breathability, which makes it a very good material for underwear.


Elastane is a stretchable fiber made from plastic. It is a material that is often added in small amounts to underwear, to add stretch and elasticity that lasts a long time.


Polyester is a synthetic fiber that dries quickly and is very durable. Therefore, it is a common material to use in functional garments such as sports bras and training underwear, as it is both moisture-repellent and highly breathable. Our Performance underpants are also made from recycled polyester.

Washing instructions for your Björn Borg underwear.

Below you can find some quick tips on how to wash your underpants and underwear in the best way so that they remain fresh and retain their perfect fit for a very long time.

• Björn Borg underpants are washed at 30-40 degrees depending on material and model. You can wash our performance underwear at 30 degrees.

• It’s a good idea to use a laundry bag when washing underwear, to protect them a little extra.

• If your washing machine has a special program for underwear, feel free to use it for a gentle and customized wash.

• Tumble underwear on low heat or air dry them to maintain the fit.

• Avoid fabric softener as it can wear out the shape of the underwear, as well as reduce their breathability. Many underwear are made with microfiber fabrics, fibers that are adversely affected by fabric softeners.

If you want to read more smart tips about laundry, you can find more laundry advice here.

Choose your size

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