95/5 Polyester/XStatic. Our Carbon-Tech Performance Lightweight Baselayer Bottom is designed to be the first line of defense against sweat and odor. Bodymapping technology reduces sweat and hotspots with seamless, super-breathable panels. With X-Static® silver fiber this baselayer is the utmost in technology and performance. Anti-odor, anti-microbial and anti-static with a UPF of up to 50+.