Revive 12 Inch Gel Memory Foam Mattress (King) (King) 12 inch cool gel infused memory foam mattress keeps you cool at night and still gives you the support you will need night after night for 25 years. 3" inches of gel memory foam, 2 inches of our unique design air flow sculpting foam. This is ideal for airflow and support. 7 inch base foam, this support foam will not let you sink in far enough into the mattress. It offers support for your back, shoulders and hips. Easy Zipper design. So you don't need to flip your mattress back and forth to unzip and wash the cover. Simply unzip the side of the mattress, pull the cover off and wash. 25 year guarantee. We have been in business for 40 years to back it up with over 1.7 million mattresses sold This premium memory foam mattress is made of the highest quality visco elastic foam available. It has been machine rolled and compressed for efficient delivery. This will not affect its performance, but it may require 24 to 72 hours to regain the first 10 inches and up to 2 weeks for a full 12 inches.