Here's what other sites are saying:
Get high-tech protection from biting wind with the dual-fabric REI Thermo neck gaiter. It stops cold breezes yet remains breathable for great comfort. Polartec(R) Wind Pro(R) fleece used on the front panel is wind resistant, water repellent and breathable to keep you warm and dry. Lightweight Wind Pro(R) microfleece used on the back panel breathes easily during high activity; Durable Water Repellent treatment sheds light rain and snow.