While great fitting boots are the key to avoiding blisters, sometimes you just have a bad day. eZeefit booties act like a second skin and create a friction barrier so that any rubbing that does occur happens on the outside of the bootie, and not against your feet. These work great wet or dry, don't have sticky glue to create messes in your socks, and are washable and reuseable. Ultrathin booties take up the least amount of space, and are a great choice if you are wearing climbing or running shoes and don't have enough extra space for the 2mm option.