Men's Fernos Insulated VestWinter runs, fitness skins or Nordic loops are all part of the game for our warm, breathable and uber aerobic Fernos Vest. The key to its core warming performance is 40 gram PeakFill Active Insulation, a highly breathable, quick recovery, spiral filament synthetic fill. Easily compressible into small spaces like a ski pack or running vest, it lofts back promptly when called on for treeline, ridgeline or rest break warmth. Mechanical stretch and side