Fourth Element RF SocksFourth Element RF Socks Created to use in conjunction with our RF series, these socks will keep the extremities warm whilst in the water so you can focus on reaching your limits. Fourth Element RF Socks Features Designed to be worn with full foot fins for cold water training A sleek simple design which supports the foots natural shape hugging your foot from your toes to your ankle. The sock lining features a Smoothskin open cell to minimise water