This overshoe is the big daddy the dhb overshoe family providing the best protection against extreme cold and heavy rain this model uses thicker 35mm neoprene for extra insulation and on the external face the neoprene is coated with a tough tpu skin this non porous skin prevents any rain from being absorbed into the surface and protects against knocks and grazes the extra thickness of these overshoes makes them ideal for harsh winter conditions and sub zero temperatures neoprene is made f