Hot Chillys Men's Micro-Elite Chamois Crewneck Long Sleeve Base Layer Shirt - The secret to the success of this men's thermal long sleeve lies in the fabric's intimate blend of enhanced polyester and spandex fibers. The result is a highly technical, high-performing men's thermal base layer top that'll keep you warm for years to come. Contrast flat seam construction Seams set away from shoulder for added comfort Smooth face for easy layering Napped back for extra warmth and softness Thumbholes Moisture Transfer Fibers to move moisture away from skin Four way stretch for unlimited movement Midweight warmth Style: HC9909