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About Crystli Mattresses: Sleep is so much important. To wake up refreshed you will need to have a good quality sleep. Crystli is here to help you do a better job in bed. NOTE: Crystli mattresses are FIBERGLASS FREE. HYBRID DESIGN FOR ALL SLEEPERS – The Certi – PUR-US certified memory foam and pocketed innerspring hybrid construction reaches a balance between firmness and softness. – The King size mattress provides the targeted support to your body proper back support alignment. No worry about slipping off the bed. STAY COOL ALL NIGHT LONG – This hybrid King mattress is made of high-end knit fabric with a comfortable and breathable surface. The air-flow foam layer has millions of open cells acting as airway chambers allow maximum airflow so the foam breathes for unbeatable temperature regulation. EDGE SUPPORT MOTION ISOLATION – The high-quality carbon steel spring coil has high flexibility and provide excellent customized support for your skeletal system. They work independently from each other effectively absorb sound and vibration evenly distributed body weight. It also reinforces the edge support and isolates motion transfer to a significant extent. – For a better sleeping experience please allow 48-72 hours for the mattress to fully expand. Twin mattress supports a maximum weight of 250 lbs while all other sizes can support up to 500 lbs Product Details: Comfort Level: Medium Firm Mattress Type: HybridMemory Foam with Individual springs Product Highlights: Breathable; Edge Support; Pressure Relief; Low Motion Transfer Mattress Dimensions: Mattress in box Full