We use the Summit Ecoloft vest when we hit the road on windy autumn and spring days or during winter trips which do not require a full jacket. This vest uses lightweight Ecoloft insulation with laser perforated panels on the sides and back providing excellent ventilation during intense activities. Dual zippered hand pockets hold all your riding essentials and DWR coating that does not contain PFC Protects against light precipitation and tire splashes. Wear the Summit Ecoloft Vest over a warm jersey for cool weather rides or under a jacket in the dead of winter