This is a 3D printed concave footpad for all versions of the Onewheel. Made from a semi-rigid polyurethane, it won't crack or chip. While not noticeably squishy, the softer surface can help mitigate foot fatigue.
The heel to toe concave is gentle, with a rise toward the tail over the last third of the pad creating a comfortable pocket for the foot. Keeping the concave noticeable but not aggressive makes it possible to install a sensor onto the pad for use in the front. The pad has holes and a recess on the bottom to accomodate the wiring from a Onewheel Original sensor.
A sensor can be obtained by buying a set of Onewheel Original footpads from Future Motion. Attempts to install a Onewheel+ sensor on a concave pad have failed, so it's best to stay with the more affordable original sensor.