The Nike Therma-Sphere Neckwarmer is a versatile and comfortable neck warmer designed for athletes. It is made from a blend of polyester, nylon, and spandex, providing a soft and stretchy feel. The neck warmer is designed to keep you warm and comfortable during your workouts, while also providing moisture-wicking properties to keep you dry. It features a 4-way stretch construction for a comfortable fit and a quick-drying fabric for optimal performance.