The Leader Graphene Quarter Zip will take base layer warmth to the next level utilizing graphene heat conduction technology. Graphene, which seeks heat equilibrium and helps to move heat from warmer areas to colder areas will use heat created in areas like under your arms and spread it to the rest of your body, helping keep you warmer while simultaneously avoiding overheating. Add 360° stretch polyester/elastane jersey material and you'll be looking great and feeling even better whether wearing this as a light standalone layer or as a mid-layer while skiing.