Sprung mattress 13.5 open coin bonnell spring for a longer life. 10" deep: 10" of deep micro quilted luxury for extra comfort. Hypo-allergenic: With four-way stretch fabric. Memory foam mattress: Get a memory foam sprung mattress. Medium comfort: Medium-firm comfort rating, ideal for those who sleep on their front. Six sizes: Choose from six sizes (see pricing below). Black Border Memory Foam Sprung Mattress | Living Social | Living Social