Four-way stretch Polartec® Power Wool® neck gaiter. In very cold conditions neck gaiters keep you warm by sealing in body heat and closing the gaps in your outerwear. Power Wool® is a design breakthrough for combining the distinct advantages of natural and synthetic fibers in a bi-component fabric. Merino wool interior against the skin, and a synthetic fibre exterior optimising wicking, breathability, odour resistance, and durability.