The Silentnight Healthy Growth Sprung Bunk Mattress is a supremely comfortable and supportive mattress built with bunk beds and high sleepers in mind. Its slimline design means it will not exceed the height of a standard safety rail, meaning your child will sleep safe and secure. Open coil springs distribute weight evenly across the mattress and provide the vital support their growing body needs. Made with innovative Eco Comfort Fibres&trade, which are cooling and hypoallergenic for a fresher night's sleep. This mattress comes complete with a Five Year Guarantee and Free Next Day Delivery.