EUC. Mild piling under arm. Otherwise mint condition. O'Neill's FUSE seam construction utilizes innovative ultrasonic welding to bond two fabric panels seamlessly. This creates a flat seam against the skin without any stitching, providing enhanced comfort. The seam stretches with the fabric of the rash guard and reverts to its original shape when released. O'Neill is proud to introduce this cutting-edge FUSE technology to the UV rashguard market, offering superior performance and comfort for water enthusiasts.