So hook and loop is made up of two sides. First, there is the hook side of VELCRO® Brand products, which is the rough, scratchy side. The hook is made up of tons of little uniform loops that are then cut in precisely the right spot to create little hooks. These hooks will stick to everything and can often stick to carpet, clothing, pets, furniture and more.http://www.quwinvelcro.com/hoo....k-and-loop/special-h