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From steep treks to ice routes, Mountain Hardwear's Stretch Ozonic Insulated Jacket gives us the protection we need in a highly mobile package. The impermeable membrane and sealed seams stop rain and snow from soaking through, while the body-mapped insulation gives us added warmth where we need it most. Ensuring we're never restricted, every material blend--shell, lining, and fill--stretches with our movements, letting us swing an axe and clamber over debris naturally and unhindered. When our limits are tested, we zip open the underarm vents to keep from overheating without having to expose ourselves completely to the elements.