Hayward AXV014SP Santoprene Shoes (4 pack) fit the Hayward AquaBug, Wanda Whale and Diver Dave above ground pool cleaners. The shoes have wear indicators on their sides and should be checked occasionally to determine if they need to be replaced. The wear indicator is a line of the side of the shoe that appears as a difference in texture. When this texture is no longer visible on the shoe when viewed from either side the shoes must be changed.