ION Thermo Tops bridge the gap between Neo Tops and Rashguards. Made entirely out of Bi_Poly jersey, Thermo Tops are quick to dry, velvety soft, warm, and fantastically robust on the external surface. With multi-purpose functions, they can be used as a thicker substitute for a Rashguard on cooler days to protect you from the dreaded wind-chill, skin chafing, and harmful UV rays. In colder waters, they can be worn under your wetsuit for additional warmth.