Here's what other sites are saying:
The REI Sunscreen neck gaiter helps shield your face and neck from harmful UV rays. Stretchy polyester/spandex blend allows the gaiter to be worn around the neck and up over the ears and nose; bottom of the gaiter flares out to cover your neck. Breathable fabric wicks moisture and is soft next to skin. With a UPF 50+ rating, fabric provides excellent protection against harmful ultraviolet rays.