Sizes: Choose between a small single, single, small double, double and king. Total depth (approx.): 21cm. 13.5 bonnell coil spring unit. Cover: Micro-quilted and a cool touch. Hypoallergenic fillings: Helps to prevent anti-dust mites. Memory foam mattress: Get a 3D ortho hand tufted memory foam spring mattress. Memory Foam Spring Mattress | Living Social | Living Social