The TCX Infinity boot is full grain leather all over with a Gore-Tex lining which will make sure no water is able to get in, Also to aid this is the elastic top of the boot to make sure nothing can drain into the boot. With no Zips to fail or break and only (re-placable) clasps and velcro to tighten the boot. One of the many things TCX have managed to get correct of the years these will certainly be around to test the time.