A sensor pad

A sensor pad comprising a first layer of padding material 10 and a second layer of padding material 11 having inner faces facing one another. The inner face of the first layer is provided with a first printed conductive ink track 13 and the inner face of the second pad is provided with a second printed conductive ink track 15. At least one of the printed tracks passes across the pad in a number of runs at a plurality of spaced locations. The first track on the first layer intersects at a plurality of locations with the second track on the second layer. At least one of the layers is provided on its inner surface with a plurality of raised portions 12 arranged over the face of the layer between adjacent runs of the conductive track and facing the inner face of the other layer to keep separate the two tracks when the sensor pad is unstressed, but which compress to allow localised contact between the first and second tracks when pressure is applied to the pad. Preferably one of the ink tracks follows a sinusoidal path.