FLIPPABLE DESIGN MATTRESS - Two sides of the mattress fit different firmness needs. The top layer of the mattress is made of gel-infused memory foam for those who prefer a soft firmness. The bottom is the high-density foam for a medium-firm feel. ENHANCED BODY CONTOURING & STRUCTURE SUPPORT - The 3-layer supporting system of this king size memory mattress brings ample support from head to toe, despite sleeping positions. Such even body support benefits to release your whole day's stress. VENTILATED GEL FOAM - This king size mattress's inner gel-infused memory foam dissipates body heat to maintain a comfortable temperature so you won’t wake up overheating at night. Enhanced airflow can keep you cool and away from tossing and turning. MOTION ISOLATION & QUIETER SLEEP - The foam layer structure can reduce motion transfer while you are turning over, and provide motion cushioning which can lower noise that may lead to disturbance, creating a quieter environment throughout the night. VACUUMED PACKED & QUALITY ASSURED - The materials we use in the mattress are certified by CertiPUR-US and Oeko-Tex Standard 100 to be free of harmful substances. Please give it 48-72 hours to expand to its original shape. It fits all king bed frames.