DetailsApply WonderWool directly to unbroken skin before activity for blister prevention or as soon as you feel a hot spot develop. WonderWool will fuse to your sock and keep it in place. Do not apply to broken skin. Biodegradable, WonderWool should be discarded thoughtfully after use. Standard size pack (approx. 25 grams) is perfect for 1 person for up to 3 days hiking.