The Mammut Fleece Neck Gaiter is a reversible neck gaiter with a soft recycled fleece interior on one side and a full-stretch knit outer on the other. Wear it fleece side in for the plush side against the skin, or flip it for the knit. What Our Gearhead(R) Experts Are Saying:"On a cold skin track I wear the fleece side in at the start, and when I've warmed up I pull the gaiter down and flip it to the knit side, so one piece covers both the start and the push. That flip is the reason I carry it on every winter tour."