The cover completely surrounds the foam but stretches so as not to restrict the foam. It is made with two separate pieces of fabric that zip together around the bottom edge.
The washable top piece is a plush knit fabric which contains 80% organic cotton and 20% polyester. The polyester is used to prevent the cover from shrinking when washed. The bottom piece is a 100% organic cotton woven fabric (not washable) that helps to prevent the topper from sliding.
The cover is very nice to have but is not a necessity. The toppers can also be covered with a fitted sheet. Most toppers are purchased without covers.
Organic Cotton (80%) / Polyester (20%) Blend Top
Organic Cotton Bottom
Sewn in our own Niles, IL factory