Summer Fabrics Guide: What to Wear When It's Hot

The coolest summer fabric is the one that lets air through and moves moisture away from your skin without clinging. For most people in hot, humid weather that means linen, followed by lightweight cotton, rayon or TENCEL™ in a loose weave or open knit. Treated polyester earns a place when you are exercising. Below, we explain why each fabric behaves the way it does, where each one fails, and how to read a garment label and cut before you buy.

TL;DR

• Linen is the strongest choice for hot, humid days. Cotton is comfortable in drier heat or for shorter stretches.

• Weave, weight and fit matter as much as fiber. A thin, loose, open construction beats a dense one in almost any fiber.

• Ordinary polyester can trap sweat, but engineered moisture-wicking polyester works well for sport and active days.

• Skip wrinkle-resistant and water-repellent finishes on everyday heat clothing, since they can reduce airflow.

• Choose by situation: office, commute, beach, workout. No single fabric wins all of them.

Table of Contents

• What actually makes a fabric feel cool
• The best fabrics for hot weather, one by one
• Summer fabric comparison
• Weave, weight and fit beat fiber labels
• What to avoid when it’s hot
• Our view: match the fabric to the day
• How to shop for summer clothes without wasting money
• Summer pieces from Shop Nova Online
• FAQ
• Sources

What actually makes a fabric feel cool

People tend to sort summer fabrics into “natural is cool, synthetic is hot.” The science is more nuanced. A 2023 peer-reviewed textile review describes thermophysiological comfort as the body keeping its thermal balance through the combined effects of your physiology, how clothing moves heat and moisture, and the environment around you. In plain terms: the same shirt can feel great in dry desert heat and miserable on a damp coastal afternoon.

Three properties do most of the work.

Air permeability

Air permeability is the airflow through clothing that helps sweat evaporate. The Associated Press notes that the structure of the weave or knit matters in addition to the fiber content. That is why a loosely woven cotton shirt can feel far cooler than a dense, tightly woven one made of the same cotton.

Moisture handling

Fabrics deal with sweat in two different ways. Hydrophilic fibers such as cotton and linen absorb moisture and spread it across the cloth so it can evaporate. Hydrophobic fibers such as ordinary polyester, nylon and acrylic push moisture away, which can leave sweat sitting on skin. The Conversation’s science explainer covers this split and notes that cotton and linen can become heavy and wet on very hot, sweaty days.

There is also a difference between wicking and cooling. According to the AP, wicking spreads sweat over a larger surface, so clothes can feel drier, but evaporation happening farther from your skin may cool you less directly. A dry-feeling shirt is not automatically a cool one.

Cling and stiffness

A fabric that hangs away from the body creates a pocket of moving air. Georgia Tech textile professor Sundaresan Jayaraman explains in a university interview on summer fabrics that hot-humid comfort depends heavily on moisture-vapor transport and on whether a fabric clings to the body, not simply on whether the fiber is natural.

Put together, fiber, yarn, construction, thickness, fit and finishes all affect how heat transfers, as a Canadian public health summary on clothing emphasizes. Treat fiber as the starting point, not the verdict.

The best fabrics for hot weather, one by one

Linen

Linen is the standout for heat and humidity. The Georgia Tech interview identifies it as especially effective in hot, humid conditions because its structure absorbs and transports moisture and has a higher moisture-vapor transport rate than cotton or polyester. Its bending rigidity also keeps it from clinging to your body, which promotes air circulation.

The trade-off is the same stiffness: linen wrinkles. Most people who wear it learn to treat creases as part of the look. If you want to see the comparison with cotton in more detail, our post on linen vs cotton by the numbers goes through moisture, strength and what to buy.

Cotton

Cotton is soft, familiar and generally breathable. Georgia Tech’s guidance is that cotton is comfortable in less humid conditions or for shorter periods in the heat. Florida State University professor Meredith McQuerry, quoted by the AP, identifies cotton and flax linen as generally breathable and comfortable.

The limit is sweat. Because cotton absorbs moisture and holds it, a cotton tee that is fine on a dry 90-degree day can feel heavy and clammy during a humid commute or a long walk. For that reason, the lightest cotton constructions (voile, poplin, seersucker-style open weaves, thin jersey) tend to feel best.

Rayon and TENCEL™

These are made from regenerated plant cellulose rather than being fully natural or fully synthetic. The Conversation says rayon and TENCEL can be more breathable than polyester or nylon. Both fabrics drape softly, which helps with the no-cling rule, making them popular for summer dresses, blouses and relaxed trousers.

So, cotton or rayon? If you want crisp, durable and easy to wash, cotton is the practical pick. If you want a fluid drape and a smoother hand in a loose cut, rayon or TENCEL is worth trying. Either way, the weight and weave still decide the outcome.

Silk

The Conversation says silk can help regulate temperature in both hot and cold conditions. It is light and feels luxurious against skin, but it marks with sweat and usually needs gentler care, so it suits dressier occasions more than heavy daily wear.

Lightweight wool

It sounds backward, but wool can work in summer. According to The Conversation, wool’s interior is hydrophilic and its exterior hydrophobic, which lets it resist water while wicking moisture. Fine, light wool is a long-time choice for warm-weather tailoring, and merino is popular for active use because it breathes and manages odor. A heavy knit is another matter entirely, so check the weight.

Polyester and nylon

Ordinary polyester absorbs little moisture, and The Conversation warns that polyester, nylon and acrylic may trap sweat in warm, humid weather. But engineered versions are a different product. Georgia Tech notes that treated polyester such as Dri-FIT improves wicking and can feel comfortable during physical activity in summer.

The AP adds that McQuerry suggests tighter synthetic garments for exercise, since they speed sweat evaporation, and looser fits for casual settings where airflow matters most.

Summer fabric comparison

Weave, weight and fit beat fiber labels

Two shirts can both say “100% cotton” and feel completely different. These are the construction details worth checking.

Hold it up to the light

Open knits and loose weaves generally breathe better than tight ones, and thinner fabrics made with finer yarns improve airflow, as REI-style gear guides and the AP both describe. If you can see light through the cloth or the knit looks airy, it will usually move air better than a dense, stiff one.

Check for finishes

McQuerry recommends open weaves and loose knits without water- or soil-repellent finishes for the greatest airflow. The Conversation adds that wrinkle-resistant treatments can form surface layers that reduce breathability. A no-iron shirt is convenient, but it may be the warmest shirt in your closet.

Choose the fit for the activity

• Relaxing, working, traveling: go loose. Air needs room to move.

• Running, hiking, gym: a closer wicking layer next to skin helps sweat evaporate faster.

• Plus-size or broader builds: loose cuts with structured drape avoid cling without looking shapeless. Our guide to plus-size summer outfit formulas shows how to put that together.

Look for ventilation features

Mesh panels, vents and back yokes with openings help in sport clothing. In everyday clothes, a polo with a lightweight knit body or pants with a straight, roomy leg do the same job more quietly.

What to avoid when it’s hot

The fabrics that cause the most regret are rarely exotic. They tend to be:

1. Dense, tightly woven fabric of any fiber. Tight constructions are less breathable.

2. Ordinary polyester, nylon or acrylic in humid conditions. They can hold sweat against the skin.

3. Cotton for hard sweating. Cotton and linen absorb moisture rather than wick it away, so neither is ideal when you plan to sweat heavily, such as a long hike.

4. Heavily treated “easy care” finishes. They may reduce airflow.

5. Clingy cuts. A breathable fabric cut too close loses much of its advantage.

For humid-climate dressing in particular, we put together a guide to clothes for hot, humid weather with outfit ideas.

Our view: match the fabric to the day

We sell everyday clothing for men, women and families, so we hear the same question constantly: “What should I buy for summer?” Our honest answer is that no one fabric is the hero. The best summer wardrobe mixes three or four.

We lean on linen and light cotton for the pieces you wear to sit, walk and socialize, because they hang away from the body. We pick moisture-wicking or quick-dry knits for polos and anything that sees golf, errands in the sun or a long day outdoors. And we look for loose, straight cuts in trousers, because even the best fiber struggles inside a snug fit.

That is also why we care about inclusive sizing. Comfort in heat depends on room for air, and a fabric that works in a small size can behave very differently when the cut is too tight in a larger one. Offering a wide range of sizes and styles is, for us, part of making summer clothing that actually performs.

— Joseph Kvarnstrom

How to shop for summer clothes without wasting money

Before you buy, run each piece through four quick checks:

1. Fiber and blend. Is it linen, light cotton, rayon or TENCEL, or an engineered quick-dry knit?

2. Weight and weave. Does it feel thin, airy and open rather than dense?

3. Finish. Does the description mention wrinkle-free or water-repellent treatment? If so, expect less airflow.

4. Fit. Is the cut loose enough to move air, or close enough to wick, depending on what you will do in it?

It also helps to know what you already own. A closet-first approach stops you buying a fourth pair of warm-weather trousers you do not need. A closet-first budget outfit planning guide shows how to build outfits from existing pieces and buy only what fills a real gap, such as one breathable linen layer.

Summer pieces from Shop Nova Online

If you are ready to put this into practice, our men’s range covers the fabrics and cuts discussed above. For hot-weather trousers, take a look at the formal linen summer pants with a straight leg or the straight-cut summer casual pants. For active days, the moisture-wicking short sleeve polo and the quick-dry polo are built for sport and warm weather.

Browse the full range of polos, coats and jackets, dresses, suits, shoes and sweaters in our complete collection, or start at Shop Nova Online for men’s and women’s clothing. If you want help turning pieces into outfits, our six men’s summer outfit formulas build an 18-piece capsule.

FAQ

What is the best fabric for hot weather?

For hot, humid weather, linen is the best-supported choice. Georgia Tech’s textile research points to its moisture-vapor transport and its tendency not to cling. In drier heat, light cotton is also a comfortable option.

Is linen better than cotton in summer?

In humid heat, generally yes, because linen moves moisture faster and holds away from the body. Cotton is softer, wrinkles less and works well in drier conditions or for shorter periods in the heat. Many people keep both.

Is polyester ever good for summer?

Ordinary polyester absorbs little moisture and can trap sweat in warm, humid weather. Treated or engineered polyester, such as the kind used in moisture-wicking sportswear, can feel comfortable during exercise. Use it for activity, and choose natural or cellulose fabrics for lounging and work.

What fabrics should I avoid in hot weather?

Avoid tightly woven, heavy or clingy fabrics, and ordinary polyester, nylon or acrylic when it is humid. Also be wary of wrinkle-resistant and water-repellent finishes, which can reduce breathability. If you expect to sweat heavily, cotton and linen are not the best picks either, since they absorb rather than wick moisture.

Are rayon and TENCEL™ good for summer?

They can be. The Conversation notes that rayon and TENCEL can be more breathable than polyester or nylon, and both drape away from the body. Look for lightweight versions in loose cuts.

Sources

• Stay Cool: Top Fabrics to Wear to Survive the Summer Heat, Georgia Tech
• Do natural fabrics really keep us cooler in summer? The Conversation
• How to choose clothes to wear in extreme heat, AP News
• Clothing Thermophysiological Comfort: A Textile Science Perspective, MDPI
• Clothing, National Collaborating Centre for Environmental Health
• Budget Outfit Planning: Wear What You Own, Buy Only What Helps

Recommended

• Hot, Humid Weather: Clothes, Outfits, and a 6.3°C Cooling Fabric
• Six Plus Size Summer Outfit Formulas That Keep You Cool
• 8 Summer Outfit Templates for Women That Survive a Sweaty Commute
• Linen vs Cotton by the Numbers: Moisture, Strength, What to Buy