Feel supported while you snooze. The hybrid memory foam and innerspring design of this mattress provides both pressure-relief and support, while upper foam layers contour to the body. Style it with an elevated bed frame to keep the air circulating underneath. Features: -Materials: 5 zone bonnell springs; memory foam top.-Medium firmness.-Hybrid memory foam & innerspring design.-Contemporary white colour with blue side.-Upper foam layer for comfort, ventilation & breathability.-Stable bonnell spring layer offers lasting support.-Size (Size: Double): Double.-Size (Size: King): King.-Size (Size: King Single): King Single.-Size (Size: Queen): Queen.-Size (Size: Single): Single.-Firmness: Medium.-Age: Adult.-Construction: Innerspring -Construction Details: Bonnell spring..-Mattress Top: Memory Foam Top -Mattress Top Details: Soft memory foam top..-Edge Support: No.-Motion Isolation: Yes.-Removable Cover: No.-Handles: No.-Box Contents: 1 x mattress -Box Content Details: Rolled & packed in a single carton that can fit through a standard door; can be easily carried up flights of stairs or taken in an elevator.-Roll Packed: Yes..-Care Instructions: Turn the mattress regularly.Specifications: -CertiPUR-US Certified: No.-Consumer Advice: WARNING: Ensure no children or pets are close to the mattress when opening. Take care when opening the plastic packaging as the mattress may open quickly. Instructions for opening 1. Place the box on a flat surface 2. Carefully cut the outer bag (do not use a knife) 3. Unroll the compressed mattress and remove the plastic bag 4. Allow 48 hours for the mattress to expand.Dimensions: -Overall Length - Top to Bottom (Size: Single): 187.-Overall Length - Top to Bottom (Size: King Single): 203.-Overall Length - Top to Bottom (Size: Double): 187.-Overall Length - Top to Bottom (Size: Queen): 203.-Overall Length - Top to Bottom (Size: King): 203.-Overall Width - Side to Side (Size: Single): 92.-Overall Width - Side to Side (Size: King Single): 107.-Overall Width - Side to Side (Size: Double): 137.-Overall Width - Side to Side (Size: Queen): 153.-Overall Width - Side to Side (Size: King): 183.-Overall Thickness: 23.-Overall Product Weight (Size: Single): 19.5.-Overall Product Weight (Size: King Single): 24.-Overall Product Weight (Size: Double): 25.-Overall Product Weight (Size: Queen): 30.-Overall Product Weight (Size: King): 37.