"Fit" is composed of four modules of different form with same characteristic. Each possesses "male" end that can be inserted and pulled out opposite "female" end of other modules. Thanks to this, it can be created box for plastic ball - pool for younger childeren(3~5), rocking chair or sitting place for more grown children(5~8). The material used is cold cured polyurethane foam in rotational moulding with pp coating.