The Comfort Control Electric Blanket by Silentnight features three heat settings that you can adjust to set the temperature so it is right for you. Made from 100 Percent polyester, the underblanket is durable but soft, providing utmost comfort. Silentnight are so confident in the quality of comfort control that they offer guaranteed peace of mind so you can sleep soundly with your purchase. Special features include overheat protection which means the underblanket will automatically shut down if the built-in thermal fuse detects a hot spot or a fault in the heated cables, the underblanket is also memory foam compatible. Please note the electric blanket is not designed to fit edge to edge on the mattress, see product images to see how the underblanket covers the mattress. Tumble-dry safe.