Knitlock fabric delivers great insulation, with flatlock seams that reduce bulk and add comfort. The InterActive zip can be used to combine the jacket with any compatible Berghaus waterproof for added protection from the elements., The InterActive front zip and attachment points at the cuffs and back of neck are compatible with all Berghaus InterActive shell jackets., Flatlock seams reduce bulk and enhance comfort., An internal chest pocket provides additional storage for smaller essentials., 100% Polyester.