If you suffer from chaffing, check out this product. Runner Trish Monks swears by it.
I have used Bodyglide Skin Formula on my lower back (when I wear my water belt over long distances it prevents my skin being worn away), on my feet to help prevent blisters, on my inner thighs to prevent skin on skin chafing and on my chest around where my sports bra rubs sometimes. It works miracles, and has prevented many a painful abrasion â€˜injuryâ€™ â€“ unfortunately itâ€™s only when I forget to put it on, that I realise just how great it is!
… I have only had only moderate success with it protecting my feet.