The Coefficient LT Hybrid Hoody is a lighter and stretchier version of Black Diamond's Coefficient fleece. Built for high-octane activities in colder conditions, it features a lightly insulated front panel with some Polartec grid fleece against the skin for added breathabilty and moisture-wicking to keep us drier (and therefore warmer) when we start to sweat on tough ascents up switchbacks or skin tracks. The Coefficient LT also features plenty of stretch and gusseted underarms to maintain a full range of motion when we're climbing, running, or skiing.