The Mountain Equipment M FROSTLINE VEST is an ultralight down vest with narrow chambers that has been specifically designed for optimal thermal performance. The water-repellent outer material provides reliable protection against moisture and keeps you comfortably dry even in changeable weather conditions. Thanks to its low weight and slim fit, it is the perfect thermal layer for anyone who doesn't want to compromise when ski touring. It can be easily worn under a jacket and offers excellent comfort and freedom of movement so you can concentrate fully on your tour.