Froli sleep systems promote healthy sleep while being extremely space- and weight-saving. By adding tension crosses, the firmness can be increased in various areas upon request, for example, for lumbar support. A standard mattress, preferably made of cold foam or latex, serves as the top layer. A handy basic package includes a complete set for the standard dimensions of sleeping areas in travel vehicles. The Froli extension package supplements missing elements for deviations from the standard size. The systems can be clipped together tightly or loosely by choosing the distance between the holes. Accordingly, the firmness can be adjusted to suit the individual's body weight.

Delivery includes:
50 standard springs
10 soft springs
60 foot crosses
10 tension crosses.