The transitional closet staple you need, CALLBACK is the knee-high boot youll wear every day. This overknee begs to be worn with both mini and midi dresses. Colour: Black. Material upper: Fabric/Synthetic. Size recommendation: We recommend you to order your normal size. Heel height: 5cm. Platform height: 2cm. Shaft height in size 37EU / 4UK: 45 cm. Shaft width in size 37EU / 4UK: 15 cm. Closure type: Zipper.