Hot Chillys MTF4000 Jewel - Women's: Hot Chillys collection Base Layer / Body Fit Fabric Eco MTF recycled polyester blend, MTF polyester yarns, spandex Finish Moisture transport to keep skin dry and to promote warmth, Bio Del Mar Antimicrobial polyester used in high moisture areas for odor control, Blend of Eco-MTF, recycled polyester and MTF micro polyester, Lightly sanded face for softness and warmth Features Contoured body fit, Soft cotton feel, Flat seam construction for seam strength and to eliminate abrasion, UPF rating of 30+,