The Borås Cotton cover with 100% cotton content and fabric prolongs the life span of your mattress topper or spring mattress. It also protects the main mattress from stains and dirt. Every corner of the cover has an elastic strap that keeps it tightly in place all night. Due to its natural qualities, it’s not waterproof. The product can be machine washed at 40 °C. Do not iron or tumble dry. The initial size of the product is a little bigger and after the first wash, it will match the right size.