The Star Memory mattress is especially created for kids keeping their comfort in mind using the traditional bonnell spring system. This mattress is particularly ideal for use on bunk beds but can also be used on any other bed frame. Any quality mattress would not be complete without a durable luxury double jersey knitted cover. The Star Memory Mattress is made from unique upper layer of high density visco-elastic polymer gel. Originally designed for NASA missions, it is soft and pliable following the outline of your body perfectly. A traditional coil spring system is included for extra comfort with bouncy support and a reflex foam boundary is used to prevent you from rolling off the mattress. Specification 2.5cm of Memory Foam 15-16 cm thickness Reflex foam boundary around springs Removable zip cover Dry cleanable cover Traditional coil spring system Ecological Sanitised Ideal for bunk beds, high sleeper and mid sleeper Made to British standards/regulations 5 Year Warranty Included Mattress Sizes 3ft (W90 x L190 cm) 4ft (W120 X L190cm) 4ft6 (W135 x L190 cm) 5ft (W150 x L200cm) 6ft (W180 X L200cm) This mattress is rolled and vacuum-packed, so please allow up to 12-24 hours to expand to its natural depth before use. Images are for illustration purposes only and subject to change.