Underwear for trail running

The right underwear makes a world of difference during trail running. It ensures comfort, prevents irritation, and helps your body stay dry and warm – from short runs to long ultra-trails.

What is technical underwear?

Technical underwear is specially developed for sports and the outdoors. It is made from breathable, quick-drying materials that efficiently wick away sweat and minimize chafing. Think of boxers, briefs, or sports bras that fit seamlessly to your body.

When do you use technical underwear?

• During every trail run, short or long
• In warm weather to wick away sweat
• In cold conditions as the first layer
• During matches where comfort is crucial

Good underwear is not a luxury, but a must-have for every trail runner.

What do you look for when choosing?

Material
Choose synthetic fabrics or merino wool. These are breathable, quick-drying, and odor-inhibiting.

Fit
Tight enough to prevent chafing, but without pinching.

Seams & finishing
Flatlock seams or seamless designs reduce irritation.

Moisture regulation
Essential to stay dry and comfortable, especially during prolonged exertion.

Different types of underwear

• Boxers & slips – for support and comfort
• Sports bras – especially for intensive exercise
• Merino underwear – ideal for fluctuating temperatures
• Seamless underwear – minimizes the risk of chafing

FAQ

Can I just wear cotton underwear?
Not recommended. Cotton retains moisture and increases the risk of chafing and irritation.

How do I prevent chafing during long runs?
Choose well-fitting, technical underwear and use anti-chafing products if necessary.