The Silentnight 800 Mirapocket Mattress is a medium-firm mattress made using sustainable Eco Comfort Fibresâ„¢. It features 800 individual Mirapocket springs that absorb movement and are zoned to support your body at key points. The Eco Comfort Fibresâ„¢ are highly breathable, promoting air circulation for a fresher mattress. This mattress is manufactured in the UK and comes with a 5-year guarantee. The soft, hypoallergenic knitted cover adds to the comfort. It is single-sided and requires rotating every few months.