HyperKewl Evaporative Cooling Deluxe Sport Vest,Silver,Medium High collar w/hook & loop neck closure for additional cooling relief and sun protection, handy front pockets, and zipper closure; designed especially for bikers. Provides 5-10 hours of cooling relief per soaking; lightweight, durable and washable. Comfortable, quilted nylon outer w/polymer embedded fabric inner, water-repellant nylon liner, and black cotton-poly elastic trim. Custom size (smaller or larger than those listed) is available on request, but there will be a shipping delay.