Using this mattress topper is easy. Just place it on your king single bed over the existing mattress. Make sure the deep - fitted walls wrap around the mattress properly for a snug fit. When it comes to cleaning, you can simply toss it in the washing machine on a gentle cycle. For best results, use mild detergent. Avoid using bleach or harsh chemicals as they may damage the microfibre filling and the cotton cover. After washing, let it air dry or use a low - heat setting in the dryer. Store it in a cool, dry place when not in use to keep it in good condition.