The Fission delivers a high level of warmth with waterproof, breathable GORE-TEX Waterproof protection. Designed for severe weather versatility, the thermally efficient construction pairs Coreloft™ Continuous synthetic insulation with a highly air-permeable liner to allow vapour to quickly reach the GORE-TEX Waterproof membrane. This improves breathability without sacrificing warmth. The hardwearing GORE-TEX Waterproof outer shuts out rain, snow and wind, and the insulated DropHood™ and collar add protection and warmth. Note: The WaterTight™ zippers are highly water resistant, but not waterproof. We do not recommend keeping items in your pockets that may be damaged by moisture.