The Mountain Hardwear Men's WindStopper Tech Jacket is a windproof fleece jacket perfect for backcountry touring, mountaineering, or layering underneath an outer shell. The windproof Gore Windstopper membrane will keep out the fiercest winds, but will still let out an amazing amount of heat and vapor during high intensity workouts. With the addition of a moisture-managing mesh lining and exta-long pit zips breathability should not be an issue. With classic performance, classic design, and great durability there is no doubt that this is an essentail addition to your jacket arsenal.