What is the difference between the Be Chill, Be Comfy and Be Relax boxspring set?

The Be Chill Boxspring Set is the entry-level model, with 7 comfort zones and a reversible mattress of 20 cm. The Be Comfy Boxspring Set offers a richer cover and a comfort layer you choose yourself, in Hybrid, Latex or Visco. The Be Relax Boxspring Set is the premium model, with 1,500 pocket springs for maximum ergonomic support and a separately designed summer and winter side.