The Mountain Equipment Trembler Jacket is built to take us up long, steep trails to windy summits. The entire jacket is built to move and stretch with us, allowing us to pump our arms as we dig deep and power our way up the mountainside. The jacket combines the best elements of windproof soft shells with EXOLITE 45 fabric, and lightweight fleece jackets with a micro-grid lining that traps heat while wicking moisture away from our skin. The breathable construction ensures we stay comfortable throughout grueling climbs, allowing us to move comfortably during long hours on the trail.