Discover reliable support and comfort with our selection of firm mattresses. Engineered to provide optimal spinal alignment and pressure relief, our firm memory foam mattresses offer a blend of comfort and stability for a restorative night's sleep. If you prefer the buoyant feel of traditional spring mattresses, we have a selection of pocket spring and open spring firm mattresses to suit your preferences. With sizes ranging from small single up to super king, we’re sure you’ll find the best firm mattress for your needs from John Lewis.