The Circle One Lycra Short Sleeve Men's Rash Vest, a great piece of kit that is perfect for wearing under a wetsuit. This rash guard will offer a bit of base warmth, but mainly it will prevent your wetsuit rubbing on key areas such as your neck and under your arms. The men’s rash vest also features a Lycra construction and all of the seams are flat lock stitched for comfort. In order to protect you from the sun, this rash guard also features a full UV Protection with a rating of UPF 50+.