HyVent® is a high quality, weatherproof membrane that The North Face uses throughout both it's youth and adult lines. Jackets and pants using HyVent® receive a polyurethane coating with multiple layers than create an excellent waterproof shield. This outer membrane is also relatively breathable due to it's gas permeability, which allows water vapor to pass through its exterior. Durability is another side effect of the coating used on HyVent® fabrics. The North Face manufactures products using this technology so that the waterproof and breathable benefits last throughout the life of the garment, standing up to machine washing and rough use.