The Volcom Over Armor Jacket is a 2-layer shell that offers waterproof & breathable protection in all but the worst weather. The Over Armour jacket has good ventilation so it can be worn on its own on warmer days leaving plenty of room for layering should conditions take a turn for the worse. Volcoms Zip Tech technology helps to stop the powder from getting in whilst a range of innovative features ensure that you have everything you might need from a whistle to attract attention to a pocket for your mp 3 player. Features V-science 2-layer shell Critical taped seams Zip Tech jacket to pant interface 2- Way adjustable quick cinch hood Super suede chin guard Mesh lined zipped vents Adjustable powder skirt w/stash pocket V-Science 2-way cuff system Brushed tricot lined handwarmer pockets Pocket access hem cinch Goggle pocket Noise pocket Stone ticket ring Whistle zip pull Waterproof Rating: 15, 000mm Breathability Rating: 10, 000gm Glossary Zip-Tech Zip-Tech technology means that you can zip the powder skirt of any Volcom jacket to any volcom pant. The system keeps the snow out & the heat in with no restriction of movement. Tricot Tricot is a thin knitted fabric that provides extra warmth & padding. Waterproof Rating This is measured & expressed as Hydrostatic Head in millimetres (mm). To find out the Hydrostatic Head of a fabric the manufacturer will take a clear tube & clamp their material over the bottom end. They will then fill the tube slowly with water & watch to see how high the column of water can get before the material lets drips through. The higher the hydrostatic head, the better the water protection. The European Standard a fabric must meet to be classified as waterproof is a Hydrostatic Head rating of 1500mm, & on average, outerwear fabrics tend to have a hydrostatic head of 10000mm & above. Breathability Rating Breathability is measured as a rating in grams of how much vapour a square metre of fabric will allow to pass through in 24 hours (g/m 2/24). It should be noted that breathable fabrics do not stop you sweating & care should be taken as to clothing worn beneath waterproof/breathable shells. High quality base layers & fleece or insulated midlayers should in themselves draw vapour from the body & pass it outwards, thus allowing the outer fabric to do its job. Cotton clothing should never be worn as part of a performance clothing layering system.