Made of durable foam.Slim-line and light-weight design, perfect for those who hate big, bulky carrying bag, easily slide in your device.It comfortably fits most laptops . We have 5 existed sizes for options,12inch,13 inch,14 inch ,15 inch,15.6 inch, 17 inch,large printing area can print your logo and make it out stand.And other sizes and colors can be customized too.