Some days it is a little chilly to wear just a rash guard, but not cold enough to justify the struggle into your wetsuit! Ion Thermo Tops are the perfect answer and bridge the gap brilliantly between the Neo Tops and Rash guards. Made entirely out of Bi_Poly jersey, these shirts are quick to dry, velvety soft, and warm. They can be used as a thicker substitute for a Rash guard on cooler days to protect you from the dreaded windchill, skin chafing and harmful UV rays. For windsurfing, kitesurfing, surfing, or just hanging out on the beach on a cool day an Ion Thermo top will keep the chill off. In colder waters, a thermo top can be worn under your wetsuit for additional warmth.