Why Choose Sweetnight Gel-Infused Memory Foam Mattress?❤ Three Firmness Levels in One Mattress ❤The bottom side offers a firm feeling, which is perfect for those who have back and shoulder problems. The top side offers a soft feeling at the head and a medium-firm feeling at the tail.❤ Two Sides Available for Different Needs ❤The flippable design allows you to choose the firmness that suits you best. You can flip the mattress according to your needs.❤ Curve Memory Foam for Targeted Spinal Support ❤The memory foam is designed with a curved shape to offer you targeted support to keep your spine in a neutral position. Sweetnight mattress will help you to wake up full of energy in the morning instead of with body aches.❤ Temperature Adaptive for Cool Sleep ❤Gel-infused memory foam will regulate your body temperature to give you cooler temperatures while you sleep at night. You won't wake up sweaty and drenched anymore!❤ One-Piece Cover and Wave Pattern Make Your Home More Advanced ❤We adopt a one-piece cover that is treated with a new process for this mattress instead of the traditional craft. The wave-pattern jacquard design makes the mattress more elegant and three-dimensional.❤ Safe with Certification ❤Sweetnight mattress is made of eco-friendly memory foam which is CertiPUR-US certified. It's safe and healthy for your kids and family.❤ Professional Customer Service Team and 10-Year Warranty ❤Sweetnight is equipped with a professional customer service team and our mattresses come with a 10-year warranty. For any problems you may have, please feel free to contact us.What is in the box?1x Sweetnight 8 Inch Queen Mattress 1x Sweetnight Sleep Opener 1x Manual Card Mattress Sizes Availability:8" Twin: 75"L x 39"W x 8"H 8" Full: 75"L x 54"W x 8"H 8" Queen: 80"L x 60"W x 8"H 10" Twin: 75"L x 39"W x 10"H 10" Full: 75"L x 54"W x 10"H 10" Queen: 80"L x 60"W x 10"H 10" King: 80"L x 76"W x 10"H 12" Full: 75"L x 54"W x 12"H 12" Queen: 80"L x 60"W x 12"H 12" King: 80"L x 76"W x 12"H Tips for Unpacking:①Place your mattress wherever you intend to sleep and unbox it.②Position your mattress on any solid base and cut the outer plastic with Sweetnight opener.③Roll out the compressed mattress and allow it to fully inflate for about 72 hours.④Enjoy and sleep tight with your Sweetnight.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.