Putting a mattress topper in the dryer would be a quick, easy solution  – you could wash, dry and put your mattress topper back on the bed before bedtime. But whether you can will depend on its material composition. Excessive heat will damage foam toppers, and we'd always suggest double-checking the care label when it comes to feather-filled, down, and polyester types, too. You can, however, put a mattress protector in the dryer.