The Immersion Research Thick Skin Union Suit Drysuit Liner is a one-piece form-fitting layering system for the coldest conditions, and will keep you toasty without being restrictive. Zipper-less super-stretch neck neoprene entry eliminates buttons, zippers, and snaps. 4-way stretch quick-dry polyester fleece is extremely soft and keeps you warm even when wet. A perfect base layer for a variety of outdoor pursuits. Skiing, snowboarding, hunting, cold weather camping, ice fishing, snowmobiling, partying, paragliding, the list is endless.