Pocket Springs are small independent springs contained in fabric pockets and stitched together, each individual spring allows the mattress to contour to your body shape.
They are more costly than open-coil springs, but provide more durability and arguably comfort, available in multiple configurations and usually found in higher-end mattresses.
Elysium 3000 Pocket Ortho Single Mattress
Elysium 3000 Pocket Ortho Double Mattress
Elysium 3000 Pocket Ortho King Size Mattress