Chafing is a trail runner’s nightmare. During a race, rubbing, sweat or poorly fitting kit can leave your skin sore. Areas such as the inner thighs, nipples and underarms are particularly prone to irritation on the trail. But you can prevent it.
Why does trail running cause irritation?
Several factors cause irritation on the trail. Moisture from sweat or rain weakens the skin. As sweat dries, it leaves behind abrasive salt crystals . Finally, repeated movements and constant rubbing cause ongoing minor skin damage. Together, these three factors increase the risk of irritation.
There are two types of irritation, which often occur together on the trail. The most common is mechanical irritation. It is caused by repeated rubbing against skin or fabric. It starts with a feeling of heat and can develop into redness or a superficial burn.
The second type is chemical irritation. Here, irritants are responsible. Salt in sweat dries out and irritates the skin, while bacteria that thrive in moisture worsen the inflammation. The skin then becomes very sensitive.
How can you prevent irritation on the trail?
The chemical barrier
Using anti-chafe cream or petroleum jelly is almost essential for long-distance trail races or in wet conditions. Before the race, apply it to sensitive areas, including your underarms, thighs, feet, groin creases and crotch.
Anti-chafe cream and petroleum jelly create a protective barrier between skin and clothing. They reduce friction, limit the abrasive effect of salt and can even prevent blisters on the trail.
Choosing the right fabric
Trail clothing should be technical, lightweight and breathable to minimise chafing. Cimalp offers, for example, trail t-shirts and trail shorts made with hydrophobic fibres. Fabrics such as polyester and polyamide are known to wick away sweat and reduce moisture.
Flat seams (flatlock) also help reduce chafing. Choose flat seams for all clothing that touches your skin. It’s a detail worth checking when choosing your trail shorts, t-shirt or underwear.
The technical base layer
Many trail runners arrive at the start line wearing boxers and fitted shorts together. It’s an effective way to prevent thigh chafing. Trail boxers and briefs are breathable and wick away sweat. Fitted shorts reduce rubbing between the thighs. Together, they help limit both moisture and skin-on-skin contact, a common problem in long races.
Protecting sensitive areas
You can easily protect sensitive areas with specialist dressings, such as blister plasters, or adhesive tape (taping). For long or technical trail races, apply them to your nipples, feet or groin creases before the start. This helps prevent the rubbing that causes irritation.
What mistakes should you avoid?
There are several mistakes to avoid if you want to reduce irritation on the trail. The first is wearing cotton, which holds moisture and dries very slowly. Cotton clothing can leave your skin damp and increase chafing.
Starting a race with new kit is a bad idea. New clothes, shoes or packs have not yet moulded to your body and can create areas of friction. Test your kit beforehand.
Likewise, a poorly fitted pack can shift and cause irritation on your shoulders, collarbones or lower back. Too tight, it compresses your body. Too loose, it creates unwanted movement. It needs to fit securely and comfortably.
The most common mistake is ignoring minor discomfort. It can turn into a burn or blister. If something starts to rub, act straight away. Adjust your clothing or kit, or apply a little cream. A quick stop now could save you valuable minutes later.
Irritation on the trail often comes down to simple mistakes. To head out with confidence, choose the right fabrics, protect sensitive areas and test your kit thoroughly. You’ll be better prepared to run in comfort.
Photo credit: Delphine Daniélou
