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.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. Ventilation & Ergonomic Design - This queen mattress with infused gel regulate temperature automatically, keep cooling for a comfortable sleep the whole night through. Middle layer with air-flow Ventilated foam, enhance breathablility of this mattress. Pressure Relief & Sleep Comfort - Our queen gel memory foam mattress gives you medium firm feel, help those who suffer back pain and make you cool during sleep. This queen mattress gives your a different support from head to foot while relieving pressure.