FROLI sleeping systems advance for a healthy sleep and at the same time saving space and weight. By clipping additional clamping fixtures the degree of hardness within different ranges can be increased when desired, for example supporting lordosis. As application a commercial mattress will do, preferable cold foam or Latex. In a handy basic package is a complete kit for the standard measure of bed format in caravans. The Froli extension package completes missing elements in the case of deviations from the standard measure. The systems let you the choice of the distance between the holes - narrow or wide. The degree of hardness can be vary according to the body weight . Shipment of basic package FROLI Star: 12 spring elements (1), 12 foot crosses (2), basic package art. no. 93012