All ION Rashguards are made of highly elastic SpanFlex_UV jersey in 8oz. (Strike/Jewel/ Trinity/Riot/Artist) and 6oz. (Element/Capture/Promo). The hand-feel and touch of this supreme material is just magnificent and makes a great difference when comparing it to other less quality products on the market. Our Rashguards have a comfortable and snug fit, to protect you from UV radiation, rash and chill. They also work great as thin extra layer of warmth underneath a wetsuit.