A heel has a body, a circuit board, multiple illuminating elements, an integrated circuit unit, a power source, a switch, a push button and a cover. The body is permeable to light and has a recess. The circuit board is received in the recess. The illuminating elements are mounted on the circuit board. The integrated circuit unit is mounted on the circuit board and is electrically connected to the illuminating elements. The power source is electrically connected to the illuminating elements through the integrated circuit unit. The switch is electrically connected between the power source and the integrated circuit unit. The push button abuts against the switch to actuate the switch when the push button is pushed. The cover is attached to the body and has a bore defined through the cover for the push button extending out from the bore.