Mountain Warehouse North Star Womens Ski Jacket - Winter Snow Jacket Snowproof fabric is water-resistant fabric without taped seams. The fabric has been treated to prevent snow and ice from penetrating the fabric, without taped seams snowproof fabric is not fully waterproof.Snowskirt A snowskirt prevents snow from entering your jacket by acting as an internal gaiter. This is an essential part of a ski jacket; the snowskirt prevents snow from entering the jacket at the hem.