Royal Plush 9 inch mattresses are made of 2# high density foam cores with a "Cool-volute" topper on both sides . Convolute is a tried and and true foam designed to promote additional air flow throughout the mattress as well as pressure reduction in shoulders and hips. The mattress become " temperature neutral for (us) hot sleepers.
This mattress comes covered in a zippered off-white cover made in B.C.
These mattresses are also available in custom sizes for boats, RV or whatever the reason you desire them to be made for.