The Uno E-Volve Sleep Comfort 4000 hybrid mattress comes with two layers of springs: The 2000 mini springs and the 2000 pocket springs. The 2 cm 2000 U-Flow Mini springs form an adaptive layer of comfort and increase airflow through the mattress to regulate your body temperature. The 2000 soft-flex pocket springs take up 16 cm of height and provides a cushion level of comfort. This design improves zonal support to each individual pressure point and reduces motion transfer for a peaceful night’s sleep. The top layer is a generous premium comfort foam that helps relieving pressure and relaxing into a deeper sleep.