How to Prevent Blisters While Running

Running blisters are caused by repetitive friction, worsened by moisture and heat. To prevent them, wear moisture-wicking (not cotton) socks, ensure your shoes fit properly, use lubricants or anti-friction products on problem areas, and keep your feet as dry as possible. Catching a 'hot spot' early — before it becomes a blister — is the most effective prevention of all.

Why blisters form

Blisters develop when layers of skin rub against each other or against your sock and shoe, and the friction separates the layers, allowing fluid to collect. Moisture from sweat softens the skin and increases friction, while heat builds up over a run. Reduce any of these factors — friction, moisture, heat — and you reduce blisters.

How to prevent blisters

1. Wear moisture-wicking synthetic or wool running socks, never cotton.
2. Ensure proper shoe fit — not too tight, not so loose your foot slides.
3. Apply anti-chafe balm or petroleum jelly to friction-prone spots.
4. Consider double-layer socks or toe socks if you're blister-prone.
5. Keep feet dry; change socks on very long or wet runs if you can.
6. Address hot spots immediately with tape or a blister plaster.

Socks and shoe fit matter most

The two biggest levers are your socks and your shoe fit. Moisture-wicking socks keep feet drier and reduce friction far better than cotton. A proper fit — snug heel, room at the toes, no excess sliding — prevents the repetitive rubbing that causes blisters. Get these two right and most blister problems disappear.

If you do get a blister

Small, intact blisters are best left unpopped and covered with a protective plaster, as the skin guards against infection. If a large blister is painful and likely to burst, it can be carefully drained with a sterilized needle, then kept clean and covered. Watch for signs of infection, and give it time to heal before stressing the area again.