BUILT Neoprene Sleeve for 13-inch Macbook Air, Bold BUILT Neoprene Sleeve for 13-inch Macbook Air, Bold Made of durable Neoprene (the wetsuit material) backed by a plush inner lining designed to safeguard the contents Easy-access zip-top opening, travels easily in bags Form-fitting design secures device in place Measures 10-2/10-inches by 14-4/10-inches by 4/10-inches