The Equipment Shop at the American Alpine Institute

The Patagonia Men's Micro Puff Jacket is a space heater for your core. Keeping your body's core insulated is the first step to staying warm and avoiding hypothermia. Your body will rob the warm blood that would otherwise go to fingers and toes to maintain a constant temperature within your torso where your vital organs are located. Cold winds, wet snow, and misty mountain weather will deplete your body of the heat that it generates. Wrapping your torso in the heat-hoarding Micro Puff will ensure that valuable heat is stored next to your body and will let your extremities enjoy added warmth. Patagonia stuffs a ton of insulation and protection into this barely-there insulator. The lightweight shell is treated for water-repellency and can stand on its own or be worn under your favorite shell. With an emphasis on packability, the Micro Puff is extremely compressible and comes in a stuff sack, so you can have it with you at all times.