Ergogreen proposes the Nordic model in the fixed version without container opening, or with container opening in the two variants Ergospace and Ergocomfort. Recommended mattress: Ermitage. Inspired by the Northern European tradition. The spring base reacts in an elastic way by absorbing the 26-rsquo; kinetic energy transmitted by the mattress. It represents the 26-rsquo; evolution of the slatted resting system offering in combination with the Ermitage mattress, the maximum of the 26-rsquo; welcome in every position taken during the rest.