Sweetnight Gel Memory Foam Mattress - Sleep Tight, Rise Bright! What makes us different from others?Flippable Design - Experience three firmness feelings in one mattress.Cooling Technology - Infused cooling gel keeps you away from hot all night.Curve Foam Structure - Conform to body shape to relieve joint pressure.Luxurious Jacquard Pattern - Make your bedroom more elegant.CertiPUR-US Certified - Let you sleep safer and healthier.No Risk - 10-Year warranty protects your consumer rights.What is in the box?1x Sweetnight 12 Inch King Mattress 1x Sweetnight Sleep Opener 1x Manual Card Tips for Unpacking:Place your mattress wherever you intend to sleep and unbox it.Position your mattress on any solid base and cut the outer plastic with Sweetnight opener.Roll out the compressed mattress and allow it to fully inflate for about 72 hours.Enjoy and sleep tight with your Sweetnight mattress.Note:- Do not be alarmed, if it has a slight odor. It is normal with new foam. Let the mattress air out for 3 days would be helpful.- Everyone's idea of firmness varies. We recommend sleeping on this mattress for a few weeks in order to give your mattress a chance to “break-in” to the way you sleep. If you still can't sleep well, please feel free to contact us at any time, we always standby to assist as you're our much-valued customer.