External Material: High density neoprene material. Internal Material: comfortable touch feeling plush * Soft and reversible neoprene can protect your devices from impact, suddenly drop, scratch, dust, oil and etc * Comfortable inner plush material can avoid making any slight scratches when your device is in * Double zipper closure provides easy access to your laptop; Dedicated pocket in accessory compartment stores your USB drive, keeping it safe and readily accessible * Fit for most 13.3 inch ultrabooks. Macbook Air Acer Aspire S3, Asus Zenbook UX31, Lenovo IdeaPad U300s, Samsung SERIES 9 NP900X3B, Toshiba Satellite Z830