Waterproof Body X Undersuit Top - MenThe Men's Waterproof Body X Top uses a new material with hollow fibres that have been developed to trap air and create a very efficient insulating layer that is fast wicking without being bulky. The Body X material is inspired by the fur of polar bears which provides excellent thermal protection in extreme cold conditions. Hollow fibres has the added benefit of being lighter than their solid equivalent, making the garment lighter. The top offers a