What Is Chafing and What Causes It?
Chafing is one of the more avoidable problems on the trail, but it still catches plenty of hikers out. It can affect anyone regardless of fitness level or experience, but with a bit of planning and the right gear it’s largely preventable. Here’s how I think about preventing and managing it.
Chafing occurs when skin repeatedly rubs against skin or fabric, and it’s often made worse by moisture from sweat. Common areas prone to chafing include the inner thighs, groin, underarms, and around backpack straps.
A few things make it worse:
- Sweat and Salt: Sweat and moisture can increase friction and soften the skin, while dried sweat can leave a salty residue that irritates the skin further.
- Hot Weather: Increased perspiration and friction are more likely in warm climates.
- Improper Gear: Ill-fitting clothes or heavy packs can create extra friction.
Understanding these causes is the first step in preventing discomfort. Thigh chafing in particular can be made worse by humidity and activity-related sweat, but it doesn’t have to keep you off the trail, since a few preventative strategies make most of the difference.
Prevention: The Best Cure
Prevention comes down to a handful of practical decisions, and clothing is where I’d start.
Clothing
Opt for moisture-wicking, quick-drying fabrics like merino wool blends or synthetic materials, and avoid cotton, since it absorbs moisture and retains it, which increases friction. Look for features such as flat seams, gussets and anti-chafing panels. Brands like Step One, Icebreaker and Macpac offer products with these features. Fit matters too: aim for a snug fit that minimises movement against the skin without being overly tight, since compression shorts or tights are often what actually reduces inner thigh chafing.
Barrier creams and powders
Even with the right clothing, a barrier cream applied before you start hiking adds another layer of protection by reducing friction directly on the skin. Sudocrem is a zinc-based emollient cream that creates a protective barrier and soothes irritation. I use a pea-sized amount, massaging it into the skin in a thin, translucent layer. If the area looks white, I use less next time. It’s effective, but it can feel heavy in hot, humid conditions, which is where alternatives like Body Glide or other athlete-specific anti-chafing creams work better, since they’re designed to be lightweight in active settings. Anti-chafing powders, including cornstarch-based ones, help keep skin dry and smooth and are particularly useful in humid conditions.
Staying clean and dry
Keeping your skin clean and dry matters just as much as what you put on it. Start with clean, dry skin before the hike. On multi-day hikes, carry a lightweight towel or wipes to freshen up, and change into clean clothes or underwear as needed. After sweating heavily, rinse salty areas during breaks to remove the abrasive salt crystals before they build up.
Hotspots and hydration
Clothing isn’t the only source of irritation. Footwear and accessories matter too, so make sure your backpack fits properly, and if you’re trail running, check your vest isn’t jostling. If discomfort begins, stop and assess it before it escalates.
Proper hydration helps here too, because it reduces the salt concentration in your sweat, which is part of what aggravates chafing. Drink plenty of water and consider electrolytes on longer or hotter hikes to maintain fluid balance and avoid over-salting your sweat, and during breaks, rinse problem areas with water to keep salt buildup down.
Managing Chafing During a Hike
Even with the best preparation, you may still feel irritation during a hike, and how you respond in the moment matters:
- Stop Early: At the first sign of discomfort, take action. Waiting will only make it worse.
- Reapply Creams or Powders: Carry a small tube of your preferred barrier cream or powder in your pack for quick touch-ups.
- Adjust Clothing: If your gear is causing friction, make adjustments or change into a spare pair of underwear or clothing.
Post-Hike Care
After your hike, give your skin time to recover:
- Clean Gently: Wash affected areas with warm water and mild soap to remove sweat, salt, and bacteria.
- Apply Soothing Creams: Use aloe vera or medicated creams to calm irritation and promote healing.
- Avoid Infection: If the skin has broken, keep the area clean and covered until it heals completely.
- Consult a Medical Professional: If chafing continues or worsens, it’s a good idea to see a healthcare professional. They can offer advice and recommend treatments, like medicated creams or ointments, to manage the issue.
Personal Experiences and Tips
From my own experience, I’ve found that prevention is key. On hot days, especially during longer hikes with a heavy pack, I struggled with chafing until I started using a barrier cream, such as Sudocrem, proactively. This change, combined with other preventative measures noted above, made a huge difference. During a 14-day trek across the Swiss Alps and several multi-day hikes in Tasmania and other areas around Australia, I experienced no chafing at all. I also carry a small “chafing kit” with essentials like wipes, barrier cream and spare clothing, a simple addition that makes a huge difference.
Other hikers in the community have shared similar strategies. Many recommend reapplying barrier cream throughout the day and experimenting with different products and fabrics, such as Lycra, to find what works best for your skin and conditions. Some have found Lycra-style shorts and compression tights effective for minimising friction, while others swear by T8 Commando Undies for comfort. Additionally, Neat 3B chafing cream and talcum powder are popular for keeping skin smooth and dry during long treks. It’s really about finding what works best for you.
Extra Tips for Long-Distance Hikes
A few extra habits are worth building in on longer trips:
- Pack a Chafing Kit: Include essentials like barrier cream, wet wipes, and spare underwear.
- Check Your Skin Regularly: High-friction areas should be inspected often, especially during breaks.
- Prioritise Quick-Drying Clothing: Re-wearing items on multi-day treks is inevitable, so choose odour-resistant, fast-drying fabrics.
- Take Breaks: Allow your skin to breathe and cool down periodically.
Chafing is an annoying part of hiking, but it’s entirely manageable with the right strategies. Choosing appropriate clothing, staying hydrated and using barrier creams covers most of what you need, and the rest comes down to paying attention early and adjusting before small irritation turns into a raw patch that ends your day.
