General Note: Please allow 24 to 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. 33" W x 72" L x 4.5" H,MATTRESS ONLY. Fits most standard fold-out sofa bed sizes. Cool gel memory foam sleep sofa replacement mattress easily folds into most sleep sofa beds and returns to its original form after many uses