Long, deep restful sleep starts deep down in our beds. Designed to isolate and absorb movement, while providing fully independent targeted support, the Cortec™ springs in a Herdysleep mattress change everything. Each individual spring is sonic-welded into its own pocket, not glued like other systems. This unique process gives each spring the freedom to move and support without being stuck, literally, to the springs next to them. All our pocket springs are made from just two things. Pocket cloth and British steel. Both are 100% recyclable. This spring system unites comfort and sustainability seamlessly.