Description of Hot Chillys PeachSkins Crewneck - Kid's Comfort and warmth to keep you moving. Features: 100% microfiber polyester, Bio Del Mar Antimicrobial Finish Lightly sueded peach finish for softness and warmth Silky feel mid-weight base layer Flat seam sewing for superior seam strength Anatomically designed shape fit without excess bulk Plush back elastic waistband in bottoms UPF rating of 30+ Warmth Factor = 7