The-collar-of-the-Amazon-GTX-balaclava-is-designed-to-be-worn-over-the-collar-of-your-jacket-to-prevent-water-from-entering-via-the-neck-It-incorporates-a-GORE-TEX-reg-membrane-that-guarantees-you-100-waterproofing-The-head-piece-is-made-of-moisture-management-materials-that-quickly-wicks-away-sweat-from-your-skin-to-keep-you-cool-when-it-39-s-hot-&-comfortably-warm-when-it-39-s-cold