【High Material for Health】The top surface is made of 3D knitted jacquard material, which is highly breathable and comfortable, keeping the surface of the hybrid mattress cool and dry. The interior of the mattress features multiple layers of supportive memory foam and individually wrapped springs to provide excellent support and comfort. Contains no fiberglass. 【CertiPUR-US & OEKO-TEX Certification】Amztree king size mattresses have passed CertiPUR-US and OEKO-TEX certification. The materials have been strictly tested and are free of heavy metals and bad substances to ensure the health and safety of users. You can sleep comfortably on a fresh, odor-free mattress. 【Motion Isolation & Reduced Interference】The Inspring mattress uses hundreds of individually packaged springs to provide personalized support for each person. The mattress's design reduces motion transfer, maintaining separate comfort levels for partners so everyone can enjoy a deeper, more restorative sleep. 【Edge Support and Pressure Relief】The perimeter spring support of the 14 inch king mattress prevents sagging or collapse, keeps the spine curve natural, reduces pressure and provides a better sleeping posture. Spring gaps promote air circulation, reduce heat accumulation, keep the mattress surface cool and dry, and create a more comfortable sleeping environment. 【Mattress in a Box】The mattress comes in a box and delivered directly to your door, no tedious assembly required. Works on box springs, platform bed frames, flat bases, and even on the floor. Please wait 24-72 hours to ensure it fully rebounds and the smell dissipates to ensure optimal performance and comfort.