Modal vs Cotton vs Ice Silk: What's the Best Fabric for Men's Underwear?

Cotton is the default for most men, and there's nothing wrong with that. But "best fabric" isn't a single answer — it depends on how you spend your day, how hot you run, and what you mean by comfort. This guide compares the three materials you'll actually see in men's underwear, with the trade-offs spelled out so you can decide for yourself.

Modal: Soft, Smooth, and Good at Managing Moisture

Modal is a regenerated cellulose fiber commonly made from beechwood pulp. It's in the same family as viscose and lyocell, and it's known for being noticeably softer than cotton, with a smooth drape and a silk-like feel.

One thing worth being precise about: how modal handles moisture depends on the yarn, the fabric weight, and whether it's blended. In general, modal manages moisture better than traditional cotton underwear and tends to feel less heavy when damp — but it's not a magic fiber, and a thin modal blend won't dry the same way a technical knit will.

If you want one pair that works for long days at a desk and still feels good by evening, modal is a strong default. Our modal boxer briefs are built around that use case: soft enough to forget you're wearing them, breathable enough for all-day wear.

Cotton: The Honest, Familiar Choice

Cotton is a natural fiber — soft, widely available, and affordable. Its biggest strength is also its biggest weakness: it absorbs moisture well, which means it holds sweat against your skin and dries slowly. For lounging, sleeping, or a mild day, that's fine. For a commute in summer or a workout, cotton can feel heavy and damp well after you've stopped sweating.

That's not a reason to avoid cotton — it's a reason to pick the right moment for it. A breathable cotton brief is still a sensible choice for casual days and for people who simply prefer a natural fiber.

Ice Silk: A Marketing Term, Not a Standardized Fiber

Here's the important part: "ice silk" is a marketing term rather than a standardized fiber name. In men's underwear, it commonly refers to lightweight synthetic or regenerated-fiber blends — nylon, polyester, spandex, or viscose blends, sometimes with a cooling finish or an open-knit mesh — designed to feel smooth, cool, and quick-drying.

Because the term isn't regulated, one brand's "ice silk" can be a very different fabric from another's. Always check the actual fiber composition before buying. That said, if you run hot or train hard, a well-made cooling knit is where the difference is most obvious. Our cooling ice silk mesh briefs use a quick-dry mesh with side ventilation, which is exactly what you want when the temperature climbs.

How They Compare

This table is meant to guide a purchase, not teach a textile course. Ratings are general and depend on the specific fabric construction.

Factor	Cotton	Modal	Ice Silk
Softness	Very good	Excellent	Good
Breathability	Good	Very good	Very good
Sweat management	Fair	Very good	Excellent
Drying speed	Slow	Medium	Fast
Odor retention	Medium	Low–medium	Depends on fabric
Stretch	Depends on blend	Depends on blend	Usually high
Hot weather	Fair	Very good	Excellent
Everyday wear	Excellent	Excellent	Very good
Workout	Fair	Good	Excellent
Travel	Fair	Very good	Excellent

Pros and Cons

Modal

• Pros: Very soft, smooth feel, good moisture management, excellent everyday comfort.
• Cons: Usually more expensive than cotton, can be more delicate, and drying speed depends on the fabric construction.

Cotton

• Pros: Natural fiber, soft, widely available, affordable.
• Cons: Absorbs sweat, dries slowly, and can feel heavy when wet.

Ice Silk

• Pros: Cool-to-the-touch feel, fast drying, lightweight, and well suited to hot conditions.
• Cons: It isn't a standardized fiber, composition varies significantly between products, and some synthetic fabrics can retain odor.

What to Wear, Based on Your Day

• All-day office wear → modal. You sit for hours and want to stop thinking about your underwear.
• Hot weather or outdoor work → ice silk (or any cooling knit). The cool-touch feel genuinely changes how the day feels.
• Gym and workouts → a quick-dry fabric. You'll sweat; you want something that dries instead of holding it.
• Sensitive skin → start with soft, breathable fabrics and pay attention to fiber blends, dyes, seams, and finishes — not just the fiber name. What irritates skin is often the dye, the elastic, or a rough seam, not the fiber itself.
• Travel → a fast-drying fabric. Rinse it in a sink, hang it up, and it's dry by morning.

One more worth knowing: if you like modal but want something with more structure, lyocell is a close cousin — a regenerated cellulose fiber that's soft, breathable, and quick-drying.

Who Should Choose What?

• Choose modal if you want everyday comfort, long-wear softness, and better moisture handling than cotton.
• Choose cotton if you prefer a natural, familiar, affordable fabric and mostly wear it for casual days or lounging.
• Choose ice silk (or a cooling blend) if you run hot, train hard, or live somewhere warm and want something fast-drying.

FAQ

Is modal better than cotton for underwear?

For most everyday wear, modal is softer and generally manages moisture better. Cotton remains a good choice for lounging, sensitive skin, or when you prefer a natural fiber.

What is ice silk made of?

"Ice silk" is a marketing term, not a regulated fiber. It usually refers to lightweight synthetic or regenerated-fiber blends (nylon, polyester, spandex, or viscose) with a smooth, cool, quick-drying feel. Check the actual composition before buying.

Does modal shrink?

Less than cotton, but it isn't shrink-proof. Washing in cold water and drying on low (or air drying) helps modal keep its fit.

Which fabric is best for the gym?

A quick-dry fabric — a cooling synthetic blend or a technical knit — because it dries instead of holding sweat.

What is the coolest underwear fabric for men?

Lightweight cooling blends and open-knit mesh (often labeled "ice silk") tend to feel coolest, but the exact result depends on the fabric structure and fiber composition.

Is modal underwear good for sweating?

Modal generally handles moisture better than cotton and feels less heavy when damp, but it isn't the same as a fast-drying performance knit. For heavy sweating, a quick-dry blend is usually the better choice.

The Bottom Line

There's no single winner: modal for most days, a cooling blend for heat and sweat, cotton for classic simplicity. If you've only ever worn cotton, trying modal is one of the easiest ways to notice how much fabric choice can change everyday comfort. Browse the full range in our men's underwear collection and match the fabric to your day.

Written by the FURQX Men's Underwear team. We focus on fit, fabric, and everyday comfort — and on being honest about what each material does and doesn't do.