A disposable diaper, in particular, for incontinent care, comprises a belt having belt sections, wherein at least one of the belt sections comprises a separating means with which at least one terminal section may be separated to match the length of the belt to various hip sizes. A method of aiding thermoregulation of the human body and a kit including a head covering and instructions for use is also provided. A flange having an outer periphery disposed, in representative embodiments, within about 20 mm of the inner periphery of the grinding face, is superposed with the concave body portion, to define a fluid flow passage between the flange and the concave body portion.