Spring spirit’s box spring covers are made of high quality material, with the elegant black color make your bed look more polished and refined. The material for box spring cover is made of 100% polyester, which make your box spring have a modern clean look. Polyester fiber is more wash durable and anti-crease comparing with cotton fabric in the same weight. The stretchy cover with deep corner pockets to fit perfectly of from 5 inch to 9 inch height of standard box spring. For low profile box spring, suggest to use some elastic straps on buttons or safety pins to adjust much material to make it fit well.