These are “tensioned” handmade air mattress covers for the intex 10 thick air mattresses. It is patent pending and please continue reading about the benefits. There is a story behind these covers but a little about the cover. They are made from durable poly/cotton fabric and use a #5 zipper to entirely enclose the air mattress. The air mattress is what tensions the cover. Why have a tensioned cover. 1a cover with durable fabric prevents holes. 2with the cover in tension, the stresses from the air mattress seams pass into the fabric seams. This now eliminates seam blowouts of the vinyl air mattress. 3most importantly, your body will not sink through the night. That’s because the cover prevents the sides of the air mattress to stretch any further than when first inflated. This eliminates the lower back pain many experience while sleeping on an air mattress. The story behind the cover was to come up with a means to sleep comfortably while tent camping. Several concepts were applied to an air mattress and ultimately the 6-sided cover with zipper was the clear winner. You do not have to worry about roots or rocks or the air mattress losing air. It’s a must have for camping sleep comfort. We have also been consulting on how to build an amazing home air bed that utilizes the cover to strengthen the air bladder component and using differing toppers for each customer’s personal comfort. For a few hundred you can build a bed more comfortable than any luxury air bed on the market. This item is made of polyester cotton blend.