The meduim duty foam is a 1.5 lb foam rated for medium use such as RV's, campers, back cushions and more. This is a firm foam, so you get a great support and don't sink through. This foam is rated for 5 seasons of life based on occasional use by an average adult.
 
Sizes:
Cot: 27"x74"
Twin: 39" x 74"
Twin XL: 39" x 80"
3/4: 48" x 74"
Double: 54" x 74"
Queen: 60" x 80"
King: 76" x 80"