FIRM FEEL – This Lucid mattress includes 1 inch of ventilated gel memory foam and 4 inches of bamboo charcoal infused support foam for a firm feel ideal for side, stomach, and back sleepers.General Note: Please allow 24 - 72 hours for your Mattress to regain its full shape. Any memory foam will expand faster in a warmer room. In cold temperature, at delivery, your mattress may take a bit longer to return to full sized from its compressed state.The expansion time of the mattress will vary as per the surrounding.Set Up: Simply take your mattress out of the box and enjoy watching it decompress. Jumping, walking, and sleeping on your mattress can speed up the process. MEMORY FOAM – A 1-inch layer of responsive memory foam provides a soft support, containing more comfort than a traditional innerspring mattress. Memory foam layer also contains ventilation holes for easy air transfer for your bed. GEL INFUSION – Top layer of the mattress contains ventilated memory foam infused with cooling gel, capturing and dissipating heat to help regulate body temperature for a more comfortable sleep climate