We carry two brands of waterproof zippers: YKK AquaGuard and a generic brand - brand is noted in the colourway as Black - YKK or Black - Other.  Both brands are intended for waterproof apparel or gear.  All lengths are chain size 5.  Polyurethane is laminated on the backside of a regular coil zipper, providing a waterproof barrier.  The YKK brand has a shinier look while the other brand has a matte look.  These zippers feature a reverse pull so that the PU coated side faces out..