K-5 Bomber w/Kling-On and Studded Kling-On Outsoles Soles: Includes Plain Kling-On & Studded Kling-On Sticky Rubber Soles Sole System: OmniTrax 3.0 Interchangeable Sole System adapts your traction to meet the performance needs of each river system Support: 5-Ply Fit System locks foot in place for a comfortable and secure fit Fit: Combination of friction-free rolling lace guides and locking lace cleat provide a customized bi-zonal fit Durability: Enhanced midsole, triple layer synthetic upper, protected stitching, 3D molded toe and heel cap