Two-layer fabric with extra warm brushed inside and smooth, quick-drying outer layer. Stretch mesh panels on the back and armpits for better ventilation. The design with 4-Way Stretch technology allows the material to be elasticity in all directions. The material perfectly wicks away sweat and dries very quickly. Anti-odor technology eliminates the growth of odor-causing bacteria. Ergonomic design with seams away from the most stressed parts. Turtleneck collar for better coverage and insulation.