Body Glide is an anti-chafing product often used by athletes on feet, legs, arms -- basically anything where you have skin/skin contact or fabric/skin contact that when rubbed together can create chafing.
Some people put it on their feet b4 putting on their socks, some put it on where the strap of sandals will rub, others put it on the thigh area b/c it rubs. You get the idea.
Found mostly at sporting goods type stores - cycle shops, running stores, Dick's Sporting Goods, Sports Authority, REI. Can purchase online also.
Go to the website bodyglide [dot] com and see where there is a location near you.
I think the stuff is AWESOME!!!! Use it all the time to prevent chafing and blisters.
Happy Travels!