Running clothing is not just about aesthetics: a poor choice of shirt on a summer day causes chafing, and heading out underdressed in winter can ruin your workout in 10 minutes. The key is wearing technical clothing (which wicks sweat) and knowing how many layers to put on based on the temperature. Whether you have been running for a month or you are preparing your third marathon, choosing the right clothing makes the difference between enjoying and suffering (World Athletics).
In this guide we explain everything you need to know: materials, the layering system, what to wear in each temperature range, the best brands for your budget, and how to care for your clothing so it lasts longer. If you want to complete your gear setup, also check out our running shoes guide and the best road running shoes for 2026 selection.
Materials: what to look for and what to avoid
The material of your running clothing determines how it manages sweat, temperature, and comfort. Not all synthetic fabrics are equal: each manufacturer uses proprietary technologies with different commercial names, but the principle is always the same: wick moisture away from the skin and dry quickly.
| Material | Advantages | Verdict |
|---|---|---|
| Polyester | Wicks sweat fast, dries quickly, affordable. The foundation of most running garments | Recommended |
| Coolmax / Dri-FIT | High-performance polyester with improved moisture channeling. Coolmax (Invista) and Dri-FIT (Nike) are the most well-known | Recommended, premium |
| Nylon | Durable, soft to the touch, good breathability. Ideal for jackets and windbreakers | Recommended |
| Merino wool | Natural thermoregulation, anti-odor even after multiple uses, soft. Regulates temperature in both cold and heat | Premium, ideal for winter |
| Recycled polyester | Same performance as virgin polyester but made from recycled PET bottles. Increasingly used by brands (Nike Move to Zero, Adidas Primegreen) | Sustainable, recommended |
| Elastane/Spandex | Stretch and freedom of movement. Always used as a blend (5-20%) with polyester or nylon | Good as a blend (5-15%) |
| Cotton | Cheap, comfortable when dry | Avoid: retains sweat, heavy, causes chafing |
An important detail: look for garments with flatlock seams. Conventional seams generate friction over the kilometers and end up causing irritation. All serious running brands already use this type of seam, but double-check especially if you buy generic or non-specialized brands.
Temperature guide: what to wear
Intense heat: 30°C+ (86°F+)
- Top: Sleeveless or tank top technical shirt, ultralight and breathable fabric (look for weights of 80-100g/m2). Light colors that reflect the sun. Shirts with mesh panels on the back improve ventilation.
- Bottom: Short shorts, split or 2-in-1 style with a built-in liner. As short and light as possible. The split (side slit) allows a greater range of motion than the classic cut.
- Extras: Cap with a visor and ventilation (essential), sunglasses with UV protection, SPF50 sweat-resistant sunscreen. Waist pack or hydration vest for water.
- Timing: Try to run before 9 AM or after 8 PM. Avoid direct midday sun. If there is no other option, reduce intensity and increase hydration.
Recommended products: Joma Combi Shirt (lightweight, affordable) · Joma Treviso Short
Moderate heat: 20-30°C (68-86°F)
- Top: Short-sleeve technical shirt. Breathable fabric of medium thickness -- no need for ultra-lightweight. A good time to use shirts from previous races.
- Bottom: Shorts or capri tights (3/4) if you prefer compression. In this range the choice is more personal: whatever feels most comfortable.
- Extras: Cap optional, sunglasses if there is direct sun. Hydration if the run is longer than 45 minutes.
Recommended products: Nike Dry Park VII (benchmark shirt) · Under Armour HeatGear Shorts
Mild temperature: 10-20°C (50-68°F)
- Top: Long-sleeve technical shirt, or short-sleeve plus a thin windbreaker you can tie around your waist if you get warm. A packable windbreaker weighing 100-150g is the most versatile garment you can own.
- Bottom: Full-length or capri tights. If it is above 15°C, shorts with leg warmers can work. Many runners do well with shorts over short compression tights.
- Extras: Thin gloves if it is below 12°C. Buff or neck gaiter to protect your throat from cool air. These are items you can easily remove mid-run.
Recommended products: Niksa Compression Long-Sleeve Shirt · XDSP Compression Tights
Cold: 0-10°C (32-50°F)
- Top (2 layers): Thermal base layer close to the body (polyester or merino) plus a second-layer windbreaker or lightweight jacket with a zipper. The zipper lets you regulate temperature by opening or closing during the run.
- Bottom: Thermal full-length tights. If it is below 5°C, tights with a brushed interior. Look for tights with a wide waistband that stays in place.
- Extras: Gloves (essential below 5°C), buff/neck gaiter, thin beanie if it is windy. Reflective vest if running at night or dawn. For more detail, read our complete guide to running in winter.
Recommended products: Thermal compression shirt · Thermal tights · Reflective vest
Extreme cold: below 0°C (32°F)
- Top (3 layers): Thermal base layer (merino or synthetic) plus insulating mid-layer (thin fleece or softshell) plus windproof waterproof outer shell. Avoid making the ensemble too bulky: thin layers are better than one thick garment.
- Bottom: Brushed thermal tights. Thick technical socks made of merino wool or synthetic material, covering the ankle well. Never cotton socks in the cold: they get wet and chill your feet.
- Extras: Thick gloves (preferably touchscreen-compatible), beanie covering your ears, neck gaiter that can be pulled up over your nose. LED headlamp if running in the dark. Vaseline on exposed areas of the face to protect against icy wind.
Rain (any temperature)
- Outer layer: Waterproof windbreaker or thin breathable rain jacket (look for at least 10,000mm water column rating). Avoid heavy rain jackets: you will overheat from sweat. Jackets with underarm vents are ideal for running.
- Underneath: Normal technical clothing according to the temperature. Polyester dries quickly even when wet. In rain, merino wool is also a good choice because it maintains its thermal properties even when damp.
- Extras: Cap with a visor (to keep rain out of your eyes), vaseline on friction zones (nipples, armpits, inner thighs). Watch out for footwear: shoes with good traction are critical on wet surfaces.
Layering system: the key to cold-weather running
The layering system is the fundamental principle for dressing in winter and variable conditions. The idea is simple: several thin layers work better than a single thick one, because you can add or remove layers based on exercise intensity and temperature (ACSM).
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- Base layer (next to skin): Its job is to wick sweat away from your skin. It should be fitted and made of synthetic material or merino wool. NEVER cotton. This is the most important layer because it is in direct contact with your skin. If this layer fails, it does not matter what you put over it.
- Mid-layer (insulation): Retains body heat. A thin fleece, softshell, or thick thermal shirt. Only needed below 5°C for most runners. Grid-type fabrics offer good insulation at low weight.
- Outer layer (protection): Protects from wind and rain. A lightweight windbreaker or breathable waterproof jacket. Must have a full-length front zipper for temperature regulation. Elastic cuffs and an adjustable hem prevent cold air from getting in.
You do not always need all three layers. Between 5 and 10°C, most runners do well with the base layer plus the outer layer (skipping the mid-layer). Below 0°C, all three layers are nearly mandatory. For more cold-weather tips, read our winter running guide.
Best running clothing brands
Not all brands deliver the same thing. Here we classify the main ones by their focus, so you know where to look based on your budget and needs.
Premium brands
- Nike: The benchmark in running clothing. Dri-FIT technology manages sweat very well. Fitted, modern cut. The AeroSwift (racing) and Pegasus (training) lines are the most popular. Mid-to-high price: 35-80 euros per shirt.
- Adidas: Aeroready and Climacool technologies. Very high fabric quality with a strong commitment to recycled materials (Primegreen, Primeblue). Similar price to Nike. Excellent tights and jackets.
- On Running: The Swiss brand that has revolutionized running. Their clothing is minimalist, very lightweight, and uses next-generation fabrics. High price (50-120 euros) but exceptional quality. Ideal for runners who want the best.
Best value for money
- Kalenji (Decathlon): The most accessible option on the market. Technical shirts from 5-10 euros that do the job perfectly. The Kiprun line steps up in performance (flatlock seams, softer fabrics) at reasonable prices (15-30 euros). Ideal for beginners or for expanding your wardrobe without spending much.
- Joma: Spanish brand with excellent value for money. Very popular among running clubs and teams. Technical shirts from 10 euros, tights from 15 euros. They work well, though the finishes are not as refined as premium brands.
- Under Armour: A step above Kalenji/Joma in price, but with technologies like HeatGear (summer) and ColdGear (winter) that work very well. Good discounts during sale seasons.
Specialist brands
- Compressport: Specialist in compression clothing for running and trail. Compression sleeves, socks, and graduated compression shirts. Very popular among ultra-trail and marathon runners. High price but very technical product.
- Salomon / The North Face: More focused on trail running and mountain, but with road running lines as well. Top-quality waterproof jackets and windbreakers.
Common running clothing mistakes
- Wearing new clothing on race day: Always test clothing in training before racing. Chafing appears with friction over kilometers, and a new garment that seems comfortable can become a nightmare from km 15 onward.
- Overdressing: The most common mistake in winter. Remember the +10 rule. If you walk outside feeling cold, you are dressed correctly. If you walk outside feeling comfortable, you are wearing too much.
- Not using vaseline: In long races (half marathon and beyond), vaseline on the nipples, armpits, and inner thighs prevents painful chafing. It is cheap, easy to apply, and can save your race.
- Ignoring visibility: If you run at night or at dawn, wear clothing with reflective elements or a reflective vest. Drivers cannot see you as well as you think.
- Wearing cotton socks: Socks are as important as your shirt. Cotton on the feet retains moisture, creates blisters, and chills your feet in winter. Invest in technical running socks: it is one of the upgrades with the best cost-to-benefit ratio.
- Buying for looks instead of function: Color and design matter less than fabric, seams, and fit. A good-looking shirt that chafes at km 8 is worthless. Always prioritize function over appearance.
- Not adapting clothing to the distance: What works for a 5K may not work for a marathon. The longer the distance, the more important it is that clothing does not chafe, that materials manage sweat well, and that seams are flat. Raise your standards with the kilometers.
To see all products with updated prices, visit our running clothing and accessories sections.
Care and maintenance of technical clothing
Your running clothing will last much longer if you care for it properly. Technical fabrics lose their properties if treated like regular clothes. Follow these tips and you can double the lifespan of your garments.
- Always wash in cold water (30°C / 86°F max): Hot water damages synthetic fibers and destroys the membranes in waterproof garments. Use the delicate or quick cycle. Do not leave sweaty clothing in your bag for hours after running: wash it as soon as possible or at least hang it to air dry.
- Never use fabric softener: Fabric softener leaves a coating on fibers that blocks breathability. Your technical shirt will stop wicking sweat and will start to smell worse. This is the most common mistake. Use only mild detergent, preferably liquid.
- Avoid the dryer: The heat from a dryer shrinks and deforms elastic fabrics. Always air dry in the shade. Prolonged direct sunlight can also damage colors and elastic fabrics.
- Turn inside out before washing: Wash clothing inside out. This protects prints, reflective logos, and outer seams. It also helps clean the side in contact with your skin more thoroughly.
- Don't mix with garments that have zippers or velcro: Zippers and velcro can snag and damage delicate technical fabrics. Wash your running clothes separately or close all zippers before washing.
- Persistent odor: If your clothing smells even after washing, soak it for 30 minutes in cold water with a tablespoon of baking soda before the regular wash. This neutralizes the bacteria that cause bad odor.
Frequently asked questions
Can I run in cotton clothing?
It is not recommended. Cotton absorbs sweat without evaporating it, staying wet and heavy against your skin. This causes chafing, cooling in winter, and greater discomfort in summer. Invest in at least one technical polyester or synthetic blend shirt that wicks moisture and dries quickly. These days you can find technical shirts starting from 5 euros at Decathlon.
At what temperature do I need full-length tights for running?
As a guideline: below 10°C (50°F) most runners prefer full-length tights. Between 10-15°C (50-59°F) it depends on your cold tolerance (capri tights or shorts with leg warmers). Above 15°C (59°F), shorts. Remember that running generates heat: dress as if it were 10 degrees warmer than what the thermometer reads.
Is expensive running clothing worth it?
You don't need to spend a lot. A basic technical shirt costing 10-15 euros works perfectly for most runners. Expensive gear (Nike, Adidas, On) offers a better cut, softer materials, and premium details, but the core functionality is similar. Invest more in shoes than in clothing: that is where the price difference actually shows in performance and injury prevention.
How often should I replace running clothing?
It depends on usage and care. A technical shirt worn 2-3 times per week lasts between 1 and 2 years before losing breathability. Tights usually last longer, between 2 and 3 years. Replace them when you notice the fabric losing elasticity, no longer wicking sweat properly, or the seams starting to chafe. If you care for the clothing properly (cold water, no softener, no dryer) you can extend its lifespan considerably.
Is tight or loose clothing better for running?
It depends on the garment and personal preference. Base layers and tights work better when fitted to wick sweat and reduce friction. Shirts can be slightly loose (regular fit) as long as they are not so wide that they chafe with movement. Shorts usually work better with a relaxed fit. The key is that no seam causes chafing on long runs.
What underwear should I wear for running?
Ideally, seamless underwear made from synthetic fabric, or no underwear at all if your tights or shorts already have a built-in liner (most running shorts include one). Never wear cotton underwear for running: it retains sweat and causes chafing. Specialized brands like Under Armour and Nike offer seamless boxers and briefs designed specifically for running.
Where can I buy good and affordable running clothing?
Decathlon (Kalenji/Kiprun brand) offers the best value for money on the market for beginners. Amazon has great deals on brands like Joma, Under Armour, and Nike during sale seasons (Prime Day, Black Friday). You can also check online outlets from brands like Adidas or New Balance where you find previous collections with discounts of up to 50%. You don't need to spend more than 15-20 euros on a functional technical shirt.
