The Siberian MK4 from SUNDRIDGE is a 2-piece heat suit and made of a super supple, waterproof and breathable Sylcatex fabric. The jacket has a warm and very comfortable Polyester lining. The collar of the jacket has a warm fleece lining and the hood is removable if desired. The jacket has two lined side pockets that can be closed with a flap and one lined chest pocket that can be closed with a zipper. The sleeves of the jacket have neoprene cuffs and Velcro Velcro straps. The padded Bib and Brace pants have a double-layer seat and are therefore also waterproof when used while sitting. Equipped with waterproof knee patches and zippers in the legs that are adjustable by means of a Velcro Velcro. The Sundridge Siberian MK4 2-piece heat suit has been a very popular heat suit for fifteen years.