This Aware Wear® T-shirt is made from 3.83 Oz., lightweight fabric. It has 100% polyester soft Birdseye knit mesh. Fabric has a moisture wicking treatment that allows perspiration to be drawn away from skin to outside of shirt for evaporation. Background material meets ANSI/ISEA 107 requirements, T-shirt is not ANSI/ISEA 107 compliant.