Every layer of the Sleepeezee Harpenden mattress is designed with a specific purpose in mind. The base of the mattress – formed with high-density polyester -and 1000 pocket springs provide excellent support to the sleeper, Two extra layers of polyester and Sleepeezee’s trademarked StayCool gel provide excellent comfort levels. Sleepeezee’s StayCool gel is the main feature of the Cooler range. This incredible gel technology, combined with the Cool Touch sleeping surface is what makes the Cooler range one of the best temperature controlling mattress ranges available today. These technologies make the mattress cool to touch in a room temperature environment and manages moisture and temperature during usage so that you can sleep peacefully at a comfortable temperature. Add to the cooling technologies and Royal Warrant worthy Sleepeezee quality, this mattress is also anti-allergenic and comes with a 10 year manufacturer’s Guarantee. You truly can sleep with complete peace of mind when you purchase this mattress!