The Select Hybrid Plus Mattress features 40% more pocket springs that the Select Hybrid for ultimate support! Combining the comfort of memory foam with over 1,200 traditional, individually wrapped pocket springs for outstanding support and reduced transfer of movement resulting in a more luxurious sleep experience. Featuring 40% more individually wrapped pocket springs, for optimum support, control and comfort A layer of pressure-relieving memory foam, originally designed for NASA, cleverly moulds to every contour of your body for ultimate support every night The 3-dimensional Ecocell® Foam core features elasticity to reduce painful pressure points as well as ensuring efficient air circulation Airmesh sides allow for optimum breathability, enhancing constant air circulation throughout the mattress every night Firmness: Medium/Firm