An outdoor all-rounder, the Atom SL Hoody is a superlight insulated layer made with milder conditions in mind. Featuring Coreloft Compact 40 in the chest & back, the synthetic insulation is light, compressible, & thermally efficient. Stretch fleece side panels, uninsulated mesh lined sleeves, & a full zip help avoid heat build-up. Particularly good on hiking trips, it can be worn as an outer layer, or under a shell when the clouds roll in.