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