Windproof and waterproof, the Masao Light is fortified with a 3-layer DRYtechnology Performance construction to shield you from piercing alpine winds, surprise snowstorms, and torrential downpours when you're miles and hours away from the finish line. Mammut gave this jacket a stormproof hood that's able to be worn over a helmet when you're on the ropes, and adjusts both vertically and horizontally with a single pull to customize your protection at a moment's notice with one hand. If the weather turns out to be warmer than you'd anticipated, zippered underarm vents help you release excess heat to stay cool and comfortable, while the adjustable cuffs and hem cinch down quickly to bolster protection when those fickle rain clouds roll back in.