There are no springs/coils inside. High-density foam with orthopaedic properties is used. The mattress features organic bamboo fabric, ensuring breathability, while a gel foam layer provides temperature control. It is made with 100% organic and breathable bamboo fabric. The listed prices are for a thickness of 7-8 inches, but custom-made options are available in higher thicknesses. Additionally, the manufacturer offers a 10-Year Limited Warranty for your peace of mind.