The Chelonia 150™ Double-Layer Neck 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. With coverage for even the coldest days, this UPF 50 Sun Protective fabric traps heat without weighing kids down. Two layers of this 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 they wear it.