This is the fabulous Luxury Charm mattress from Myers, it has a twin spring build with dual response open coil springs for double the comfort and support - with 650 backcare springs in the king size model. Featuring layers of rich white fibre to provide a supportive surface guaranteeing you a good nights sleep. The Luxury Charm is an easy-care, single sided mattress with integral cotton felt tufts for extra stability. It's mattress edge is fitted with a heavy gauge wire for extra support.