Oxford Advanced Thermal Base Layer Mens Top - CharcoalEach garment in Oxford's Advanced layering system has a unique purpose base, mid and outer combined to keep you comfortable, warm, dry, and protected. Advanced performance base layer, for all around use. Designed to draw sweat from the skin allowing it to evaporate quickly to keep you dry, and cool and help maintain a comfortable core temperature. Key Features: Multi season base layer top Slim fit Lightweight Seamless construction Thermal rating 2