The Seychelles mattress by Serene Sleep sits between a medium and firm on the comfort scale, perfect for those people who like to sleep on their backs. The Seychelles mattress features pocket spring technology with 638 independent coil springs in a queen size mattress. Unlike traditional spring systems where the springs are joined together, pocket spring mattresses are made up from independent coils. Having independent coils helps to isolate movement from spreading across the mattress. The result is reduced partner disturbance. The coils also allow the mattress to contour to your unique body shape providing unparalleled comfort and support for your spine.