The Chelonia 150 double-layer neck gaiter is designed to be as comfortable as possible: it is comprised of our soft and warm water-resistant, midweight fleece, which makes it perfect for all outdoor activities. For coverage for even the coldest days, two layers of this ultra soft fabric trap heat and keep it within the wall formed in its design. The perpetual rolling nature of the seamless construction means that your neck maintains full coverage from all angles regardless of how you wear it. Size: OS.