The suit has a base of 2 mm extremely flexible neoprene. Glideskin neoprene in upper part with 4 mm Air cell-panels placed on the chest for great buoyancy. 1.5 mm around arms and shoulders for extra flexibility and movement. Lower part is designed for optimal running properties. Nylon covered neoprene for best balance between flexibility and durability. Front zipper to easily open up while running. Comes with an small and effective whistle for security. Heat taped seams for individual length adjustment of both arms and legs.