The invention relates to a dock pole bumper assembly for securing a boat to mooring piling. The assembly has a stationary portion which is secured to the piling and forms a track along which the movable portion glides. A movable portion has a rigid part and a flexible deformable part. The rigid part is provided with a guide channel for engaging the stationary portion during use of the bumper assembly. The resilient deformable portion has an impact-receiving contact surface and non-contacting opposing side walls. Mooring cleats are mounted on the side walls of the rigid member to allow a mooring line of a boat to be secured thereto. An insert of a friction-resistant material is fitted in the guide channel to facilitate movement of the movable portion along the stationary track.