Windwall Fabrics are North Face's answer to windproof fleece. The Windwall technology uses a unique fabric bonding process that allows only a tiny amount of external air to permeate the fleece. This reduces the effects of windchill and enhances the user's warmth and comfort.
Rip Stop is a lightweight nylon fabric with interwoven rip-stop reinforcement threads in a cross hatch pattern. It's woven with a coarse, strong warp and filling yarns at intervals so that tears will not spread. Rip-stop is used in construction of hot air balloons and yacht sails but in this case very effectively on outdoor clothing.
Breathable fabric allows air to circulate, which helps regulate body temperature.
When the weather's not co-operating, this feature will resist the penetration of water to some degree but not entirely.