Brooks All Altitude Jacket Men's Stand up to the elements in a streamlined layer. The Brooks All Altitude weatherproof running jacket shields you from wind and rain while also packing down for easy storage if the weather improves during your run. Face the elements fearlessly in the Brooks All Altitude Jacket! Lightweight knit laminated DriLayer® Seal material is highly wind- and water-resistant, keeping you dry and protected. Jacket can be stuffed into a pocket on the hood then easily stowed for packable convenience. Minimal and lightweight design with elastic finish at the wrists, hood and bottom for a secure fit that keeps the elements away. Chin guard Draft-flap snaps keep jacket in place if you unzip for ventilation Zip-secure chest pocket Stowable hood Hanger loop Sizing Small: 35-37" chest Medium: 37-39" chest Large: 40-42" chest X-Large: 43-45" chest *Measurements refer to body size, not garment size.