The Chinook Summit Bivvy Bag is a super light, hiking friendly alternative when a heavy tent is just not an option. It uses Featherlite aluminum poles to create a self-supporting canopy around the head and has a spacious foot box so you get added breathability and movement. The bottom is waterproof Ripstop nylon and the top is waterproof but breathable fabric. Together with the factory-taped seams this ensures the rain stays outside. It features a contoured hood and facial ventilation system for maximum comfort and breathability. It's the ultimate shelter for multi-day hiking trips into the mountains where there isn't room to pitch a tent on the steep slopes.