This one-piece men's base layer eliminates bunching and cold spots, making it ideal for colder temperatures. The water-resistant cuffs and a low-profile drop seat ensure all-day comfort. Bluesign® certified fabric offers body-mapped gridded fleece for insulation where it's needed most. The half-zip design provides quick access to ventilation and makes it easy to get in and out. Flat-locked seams create next to skin comfort and eliminate any irritation points, and the underarm and crotch gussets allow for greater mobility. The Men's Kazan Drysuit Liner provides a robust thermal system for in-water performance and warmth when paired with Mustang Survival dry suits. The low collar accommodates the drysuit seals to ensure the water stays out.