The Incase ICON sleeve for MacBook incorporates advanced Tensaerlite technology along with a lightweight EVA bumper frame to ensure maximum impact absorption. A magnetic snap closure further secures your MacBook, while allowing for easy access. The ICON Sleeve features Woolenex, a woollen polyester material that repels moisture, mildew and chemicals. This ultra-durable polyester-based fabric with the hand feel of a cotton blend has high abrasion resistance and is resistant to stretching and shrinking.