Chances are you already have a down jacket, a synthetic insulation piece, and a fleece for layering, but none of these layers offer the benefits of merino wool. Insulated with merino wool, the Ibex Men's Wool Aire Matrix Insulated Jacket is a breathable insulator that will can be warm either on its own as a belay jacket, or layered under a shell during winter pursuits. The Wool Aire isn't built just to keep you warm it's also designed to keep you mobile, so Ibex integrated stretch underarm panels, which are made with a merino wool blend for better breathability and antimicrobial properties in areas that tend to sweat more. The jacket has semi fitted cut, so it will fit comfortably under a shell, and it has an adjustable hem that can be locked into place to help tram more heat. The shell material is made with a 100% recycled nylon that is water resistant, and the inside is made from a partially recycled material, making the jacket an eco friendly option.