What Is the Best Material for Men's Underwear? Cotton, Modal, Polyamide and Polyester Compared

There is no single material that is best for every man and every situation. Cotton and modal are strong choices when softness and everyday comfort come first. Polyamide and polyester are more interesting when a lightweight, smooth, or quick-drying fabric matters. Elastane is usually added in a small percentage for stretch and shape retention.

Still, the material name on the label does not tell the whole story. The thickness of the fabric, the knit, an open mesh structure, the finish, the amount of elastane, the seams, and the construction of the pouch all determine how men’s underwear ultimately wears. In this blog, I compare the main materials so you can better decide what suits you.

Cotton, modal, polyamide and polyester at a glance

These are general properties of the fibers. For example, a thin cotton fabric can feel airier than a thick polyester fabric. The final performance therefore always also depends on the construction of the textile.

What does the material on the label actually tell you?

The care label usually lists a blend of fibers, for example 95% cotton and 5% elastane or 90% polyamide and 10% elastane. The highest percentage often largely determines how the fabric feels and how it handles moisture. A smaller share of elastane then provides extra stretch and helps the garment return to its shape after being stretched.

A material list is useful, but not enough to predict the fit. Two briefs made of 95% cotton and 5% elastane can still fit very differently because of different fabric thickness, waistband, pouch or cut. So, in addition to the material, always look at the fit and size chart. Also read my blog What size men’s underwear do I need?.

Cotton: comfortable and strong for everyday use

Cotton is a natural cellulose fiber and has long been one of the best-known materials for men’s underwear. The fabric usually feels soft and can absorb relatively large amounts of moisture. For normal everyday use, that is pleasant: a small amount of sweat is absorbed by the fibers instead of staying directly on the skin.

That same property also has a downside. Once cotton has absorbed a lot of moisture, it can stay wet or clammy longer than many synthetic fabrics. That is why a heavy cotton boxer is not automatically the best choice for intense sports or a very hot day.

When is cotton a good choice?

• for everyday underwear;
• if you like a soft and familiar fabric feel;
• if you do not have a specific need for a technical quick-drying fabric;
• for briefs, boxer trunks and other styles where comfort throughout the day is central.

Many cotton men’s underwear styles contain a small percentage of elastane. This makes the fabric more stretchy and helps prevent the underwear from feeling baggy during wear.

Modal: extra soft and supple

Modal is a regenerated cellulose fiber. It is made from cellulose, usually derived from wood, which is processed into a new fiber. Modal is especially popular in underwear because it can feel very soft, supple and smooth against the skin.

Like other cellulose fibers, modal can absorb and release moisture again. So it is not the same type of material as polyester or polyamide, which absorb much less moisture into the fiber itself. For underwear, modal’s appeal is mainly about the soft feel on the skin and the fabric’s fluid drape.

Is modal better than cotton?

Not necessarily. Modal often feels smoother and softer, while cotton gives many people a familiar and slightly firmer feel. Which of the two is more comfortable remains personal. The quality of the fabric and the way the underwear is made also matter a lot.

A modal blend with elastane can fit very smoothly, but a well-constructed cotton brief may provide more structure. The material should therefore match what you expect from the style.

Polyamide: smooth, light and strong

Polyamide is the collective name for a group of synthetic fibers. Nylon is the best-known variant. In men’s underwear, polyamide is widely used for smooth, light and stretchy fabrics, as well as for mesh, swimwear and clubwear.

Polyamide absorbs less moisture into the fiber than cotton and modal, so in many applications it dries relatively quickly. It can also be made thin without immediately feeling heavy. That makes it interesting for underwear where a smooth surface, a light fabric or a technical look is desired.

When is polyamide interesting?

• for light or smooth briefs and jockstraps;
• for sheer or open mesh fabrics;
• for swimwear and sporty styles;
• if you want a fabric that generally dries faster than cotton;
• for clubwear where shine, transparency or a technical surface is part of the design.

An important detail is that polyamide is not automatically cooler or more breathable. An open polyamide mesh can let a lot of air through, but a tightly knitted and heavier polyamide fabric can actually feel warmer. Ventilation is therefore strongly determined by the fabric construction.

Polyester: practical for sport and quick-drying underwear

Polyester is also a synthetic fiber, but it absorbs very little moisture into the fiber itself. As a result, polyester can dry quickly. In sportswear, it is also often constructed or finished so that liquid sweat is spread through the fabric over a larger surface, making it easier to evaporate.

That does not mean every polyester boxer automatically wicks moisture well. The shape of the fibers, the yarn, the knit, the thickness and any finishing make a big difference. A technical sports shirt and a simple thick polyester fabric can therefore perform completely differently, even though polyester is listed on both labels.

When does polyester work well?

• for sports and intense movement;
• when a short drying time matters;
• for lightweight technical underwear;
• when traveling and you want your underwear to be ready to use again quickly after washing.

For everyday use, polyester is not automatically better than cotton or modal. If you mainly want a very soft, more natural or more absorbent feel, a cellulose fiber may be more comfortable.

Why is there elastane in men’s underwear?

Elastane, also known under brand names such as Lycra, is rarely used as the main material. You usually see it as a smaller percentage alongside cotton, modal, polyester or polyamide.

Its function is mainly mechanical: elastane can stretch a lot and then return toward its original shape. That helps a waistband, pouch and leg opening move with the body without the whole fabric immediately losing its shape.

More elastane is not automatically better. A higher percentage can make a fabric firmer and more stretchy, but the final pressure and fit also depend on the pattern, fabric thickness and construction. So do not look only at the elastane percentage when you want to predict how a style fits.

Which material is best if you sweat a lot?

If you sweat a lot, a technical polyester or polyamide fabric is often interesting because these fibers absorb little moisture themselves and can therefore dry relatively quickly. For sports, that can feel more comfortable than a heavy cotton fabric that keeps holding on to more and more moisture.

But here too, the construction is decisive. A thin mesh fabric with lots of open space can ventilate, while a dense synthetic fabric can hold in warmth. For intense movement, therefore, look not only for the words polyester or polyamide, but also for a light construction, mesh zones or a product specifically designed for sport and moisture management.

Which material is best in hot weather?

There is no material that wins in every hot situation. A thin cotton or modal brief can feel comfortable because the fabric is soft and absorbs moisture. A light polyamide mesh can be pleasant because plenty of air can move through the open structure. And a technical polyester fabric can be attractive when you expect to sweat a lot and quick drying matters more.

In hot weather, pay attention especially to three things: fabric thickness, ventilation and moisture behavior. That combination says more than the fiber name alone.

What is the best material for a jockstrap?

With a jockstrap, the pouch and waistband play a larger role than with many other styles. Cotton or modal can be pleasant for a soft pouch, while polyamide or polyester can be interesting for sporty, mesh or clubwear versions. A share of elastane usually helps the pouch move with you.

If you want maximum ventilation, an open mesh construction can be attractive. If you want a soft feel for everyday use, cotton or modal is the more obvious choice. Also check the jockstraps at GUNDERWEAR to see the different materials side by side.

Material is not the same as quality

A product is not automatically good because it contains modal, and not automatically worse because it contains polyester. The quality of men’s underwear is determined by the whole product.

Pay attention to, among other things:

• the quality and weight of the fabric;
• the elasticity and recovery after stretching;
• the finishing of the seams;
• the quality of the waistband;
• the construction of the pouch;
• the cut and sizing;
• how the fabric holds up after repeated washing.

That is why a high-quality polyester jockstrap may suit a certain use better than a mediocre cotton version. The material is one part of the assessment, not the final answer.

Material combinations are often chosen intentionally

Many men’s underwear styles are made from a blend. Manufacturers combine fibers specifically to bring together different properties. A common combination is cotton with elastane: the cotton largely determines the feel and moisture absorption, while the elastane adds stretch.

With polyamide or polyester, you also often see elastane. That results in a light synthetic fabric that can move more with the body. Modal is also often combined with elastane or with other cellulose fibers.

A blend is therefore not automatically a compromise. It may actually be meant to combine softness, strength, stretch, moisture behavior and shape retention in one fabric.

How do you wash cotton, modal, polyamide and polyester?

The right wash cycle does not depend only on the main fiber. Waistbands, prints, elastane and other components can be more sensitive to heat than the base fabric. So always follow the care label of the specific underwear first.

For men’s underwear, unnecessarily high heat is usually no advantage. Elastic components in particular can wear out faster from it. More practical information can be found in my blog Washing underwear: how many degrees and can it go in the dryer?.

Which material for men’s underwear suits you?

If you are mainly looking for everyday comfort, cotton and modal are logical materials to start with. Modal usually feels smoother and more supple, cotton more familiar and firmer.

For sport, travel and quick drying, polyester and polyamide are often more interesting, especially when the fabric is specifically designed for moisture transport or ventilation. For mesh, swimwear and bold clubwear, you will also often see polyamide and polyester, because these fibers make many different textile constructions and finishes possible.

In the end, the best material is the one that fits the use, the style and your preference for fabric feel. Are you still figuring out which style suits you? Then read What types of men’s underwear are there? or check the complete men's underwear at GUNDERWEAR.

Frequently asked questions about materials for men’s underwear

Is modal better than cotton for underwear?

Not in all cases. Modal is often softer, smoother and more supple. Cotton feels familiar to many people and also absorbs moisture well. The best choice depends on your preference and use.

Is polyester bad for men’s underwear?

No. Polyester has different properties than cotton or modal. It absorbs little moisture into the fiber and can dry quickly, which makes it useful for technical and sporty underwear. The quality of the fabric construction remains important.

What dries faster: cotton or polyester?

Polyester generally dries faster because the fiber absorbs much less moisture than cotton. The actual drying time also depends on the thickness, knit and finish of the fabric.

What does 95% cotton and 5% elastane mean?

It means that cotton makes up most of the fabric and elastane has been added for stretch and shape recovery. The feel of the fabric and moisture absorption are therefore mainly determined by the cotton, while the elastane helps it fit the body.

Is polyamide the same as nylon?

Nylon is a type of polyamide. On European clothing labels you usually see the general fiber name polyamide.

What material is best for sports underwear?

For intense sports, lightweight technical fabrics made of polyester or polyamide are often suitable, especially when they are designed to spread moisture and dry quickly. An open or light fabric construction is at least as important as the fiber name.

What material is the most breathable?

That cannot be determined from the fiber alone. Air permeability strongly depends on how tightly or openly the fabric is knitted. An open polyamide mesh can, for example, let through much more air than a thick cotton fabric, while a thin cotton fabric can be airier than a dense synthetic fabric.

Conclusion: look beyond cotton or polyester alone

Cotton is strong for everyday comfort, modal for a very soft and supple feel, polyamide for light and smooth fabrics, and polyester for technical and often quick-drying underwear. Elastane usually adds stretch and shape retention to these materials.

None of these fibers is the best in every situation. The smartest choice is to assess material, fabric construction and style together. That way, you choose not just a fabric that sounds good on the label, but men’s underwear that truly fits how you want to wear it.