Abstract: A light weight supporting board, which is adapted for incorporating with a playyard, pen, cot, and bed, includes a boundary frame, a supporting pocket and a retaining device. The supporting pocket includes a first layer having a tension surface and a second layer overlapped with the first layer to define a receiving cavity between the first layer and the second layer. The supporting pocket defines at least a U-shaped edge holder. The receiving cavity of the supporting pocket has a size and shape adapted for fittedly receiving the boundary frame. The retaining device is provided on the edge holder of the supporting pocket for securely enclosing the boundary frame in the edge holder and retaining a predetermined tension for the tension surface of the supporting pocket.