Product Description OmniTrax Sole System: Features patented interchangeable outsoles; typically includes both Felt (for slippery rocks) and Kling-On Sticky Rubber soles. BOA® M2 Fit System: Uses a stainless steel lace and dial for a fast, secure, and custom fit that won't loosen in water. Durability: Built with hydrophobic (fast-drying) synthetic uppers, a molded TPU toe cap for rock protection, and protected stitching. Performance: Includes internal drainage channels to shed water weight and 3PFS Achilles stabilization for ankle support. Size: US Men's 10.