During the winter months, layering up your clothing will keep you warm and insulated from the cold weather and the Two-Piece Undersuit has been designed as an ideal and super-warm layer for when the cold weather hits and is perfect to be used over the Reax Base Layer. Featuring a detachable hood, neck zip and elasticated cuffs to keep out draughts on the top and zip legs with a drawcord waist to allow for easy getting on and taking off, it is available in five sizes ranging from Small to XXXL.