Down is great, but work up a sweat while wearing it, and you're pretty much done. The North Face designed the Men's ThermoBall Hybrid Hooded Insulated Jacket specifically to keep your core warm while you're working up a sweat. Primaloft powered Thermoball insulation is placed throughout the torso to warm your innards, while The North Face's Apex Aerobic soft shell material is placed at the sleeves and sides to promote breathability when you're on the move. Thermoball insulation not only mimics the insulating properties of down, but it is also highly compressible. This jacket has a stowable design, so you can easily pack it along whem your hiking, climbing, or backcountry skiing. Elastic binding at the cuffs and hem helps trap heat, while the drop hood shields your face from bone chilling ridge line winds. You won't want to leave home without this versatile and technical insulating layer, which is great for almost any outdoor objective.