Milo King 15cm Memory Foam MattressThe perfect mattress for those looking for a firm style mattress is the Milo 15cm king memory foam mattress. Made with 2. 5cm memory foam and 12. 5cm reflex foam, this makes for a comfortable night sleep. It comes with a jacquard knitting cover and a non slip bottom. We recommend that this is a firm mattress, but comfort is subjective to all! The memory foam density is 60kg m3 and reflex foam density is 30kg m3.