Sleeveless Compression Shirt features a built-in pocket for protective NOCSAE® Chest Guard Outfitted with a two-piece collar and side mesh paneling for exceptional comfort and breathability SAS-TEC™ Material: Manages and absorbs impact while giving players an ergonomically contoured fit on the field. SEI-Certified: Meets 2020/2021 NOCSAE® standard for protection against Commotio Cordis Youth sizing