Innovations in materials have perfected layering apparel to stay warm in the coldest conditions. An effective layering system essentially consists of three layers that work together to insulate, manage moisture and protect from the elements - an outer layer for protection, a middle layer for warmth and at the core, a good base layer for warmth and comfort.Depending on your activity, Safeware Inc. has various styles of base layers available. From crew neck shirts to boot socks, we have you covered.The relaxed fit crew neck shirt is made of merino wool. It features seamless underarm, raglan sleeve with no seams on shoulders, tag-free neckline and single needle high strength stitching.The men's long john bottom features flattened seams for increased comfort. Fly body hugging fit, tag free, and high stretch flatlock stitching.The Sentinel Thermal Base Layer is designed as part of a full thermal management system; these two new base layer options have been constructed for optimal compatibility with Mustang Survival dry suits.Accessories usually bought jointly include stamina boot socks, special industry boots and the tool belts.Browse Safeware Inc's large supply of thermal apparel you need, large sizes included.