The Memory 200 mattress has 20mm of memory foam with high density foam as a base layer. With a micro quilted design and cool touch soft knit fabric this will keep you at the optimal temperature through out the night. The boarders are stitched to help against corrosion. The model is a no turn just rotate follow the booklet guide that comes in the packaging. To make things more easy it comes rolled up so it's easy to handle when delivered.