A neck gaiter is always a super useful cloth to bring along for everyday use in the city or when you are hiking, skiing, biking, etc.
You can use it as a neck warmer, a beanie or a wrist band. Placed over the mouth it can protect you against dust and sand. You can also use it as a beanie under your ski helmet.
The Oakely Cortina Neck Gaiter is one size - 43cm long and made in 100% polyester.