Patented, puncture-resistant sole that offers maximum sensory feedback (proprioception). VB zero-pitch aligns to the axis of the foot for a perfect barefoot feel. Latex rubber and TPU abrasion resistant outsole. Breathable, EVA construction allows them to easily shed water. Adjustable, elastic lacing system for quick, customized fit. Change the way you workout with the modular and minimalist Ultra Shoe. Ultra is the first fully molded, anatomically neutral athletic shoe, and, at less than 4 oz., it is the lightest amphibious barefoot running shoe on the market. The thin (7mm), zero-drop EVA sole offers excellent ground feel, while also providing secure grip and protection that make them suitable for light trail cross training, water sports, long runs, and general beachside and urban barefoot exploration. . . . . . Roomy, textured foot bed provides responsive cushioning and nonslip performance . Removable plug-in mesh tongue . Removable, antibacterial mesh sock is machine washable . Mesh sock can also be worn alone for protection from hot sand. 100% vegan (non-leather) shoe produced using sustainably sourced materials with efficient and eco-friendly production techniques . Sole Thickness: 7mm, compresses to 3mm . Weight with socks: 4 oz. . Weight without socks: 3-1/2 oz. .