ZSkin tops are built with the lightest, stretchiest and thinnest neoprene available. Cut wind chill, and maintain insulation without overheating. Experience the unique temperature regulation only possible through this ultra-thin construction. ZSkin adds a second skin with superior water shedding ability to cut more wind chill. For high upper body workloads and warmer conditions, choose the ZSkin Hybrid top, which provides targeted warmth on the chest and back panels and combines this with mesh and spandex panels in the arms and side.