adidas Size Chart The Alpha Shield Hoodie uses a PERTEX QUANTUM(R) face fabric for windproof,lightweight protection with excellent durability. A thin layer of POLARTEC(R) ALPHA insulation gives perfect warmth without weight, is highly breathable, and insulates when wet. The Alpha Shield Hoodie is equipped with 2 security hand pockets, an internal pack-it pocket, and an adjustable hem with elastic draw cord. Features: - PERTEX QUANTUM(R): Offering best strength to weight ratio. - POLARTEC(R) ALPHA: Warmth without weight, breathable and insulates when wet. - Adjustable hood. - Pack-it pocket for easy storage. - Two security hand pockets. - Adjustable hem with elastic draw cord. - Shell: 100% nylon ripstop - Spring/Summer 2017