The Spandex rash guards are developed for rash free comfort for your lower leg inside your ski boots or snowboard boots. The smooth surface from the Spandex will give you a rash free feeling and your boots will be fitting much more comfortable. Regular knitted ski socks can sometimes cause that uncomfortable feeling on pressure points created by the structure from the knitted fabric. This uncomfortable feeling will no longer appear when you wear the Spandex rash guards The rash guard is an old surfer’s trick; they are using this fabric already for years for optimal rash free comfort.