The North Face Womens Primero Backpack relies on the trail-proven X-Radial suspension system, with crossed 7075 aluminum stays that pivot as you twist or bend. As a result, you spend less energy compensating for pack shift and have more juice to reach the summit. The EVA foam back panel cushions, breathes deeply, and resists odor. It wipes clean easily and retains its shape and consistency even after heavy abuse. The North Face designed this multi-day pack with a durable, water-resistant body, a waterproof bottom, and a waterproof hood to protect your gear from wet surfaces and rainy weather.