A rash vest is a fitted garment, worn to protect the skin from irritation from the salty water. A rash vest is also useful for protecting the skin from harmful UV rays & as an extra layer of warmth when worn in the water or underneath a wetsuit. Traditionally, a rash vest is tight fitting (to trap water between the skin & the vest, creating warmth) however the O' Neill Sonic Distortion Skins rash tee is more of a t-shirt style, making it perfect for wearing on the beach too. The O' Neill rash tee is made from quick drying polyester & features a clear printed O' Neill logo design across the chest. The O' Neill rash guard also has a loop on the hem to enable you to connect the vest to your boardshorts which prevents the vest from rising up whilst in the water.