Sierra Sleep Peak 2.0 Bonnell M20151 California King MattressPure sleep perfection. With this California king mattress, restorative rest is easier than ever. You can snooze soundly on its layers of comforting quilt foam and luxury loft fiber. A classic Bonnell coil unit and supple base foam provide the support you need. And the mattress is topped with a Hyper Cool cover, helping to keep your temperature regulated through the night.