The Arroyo II combines all the best features of a trail shoe and a sandal. Open vents on the side of the waterproof leather upper provide maximum breathability. The multi-directional lug outsole bites into varied terrain with determination. This hybrid design redefines outdoor footwear with performance you can count on. Weight: 13.7oz / 388grams Lining: Nylon. Stretch Mesh Rubber: Non-Marking rubber outsole Upper: Leather, Webbing, Mesh 4mm multi directional lugs - AEGIS Microbe Shield treated Hydrophobic mesh lining - Patented toe protection - Removable metatomical Footbed - S3 Heel support structure - Secure foot lace capture system - Torsion stability ESS shank - Washable waterproof leather upper HYBRID.OLOGIES: S3 Shock, suspension, stability – otherwise known as S3 – is engineered to support the foot on impact, dissipate shock and reduce your odds of twisting an ankle. AEGIS MICROBE SHIELD Shock, suspension, stability – otherwise known as S3 – is engineered to support the foot on impact, dissipate shock and reduce your odds of twisting an ankle. KEEN.PROTECT Can a sandal protect your toes? The answer is yes. The reason is KEEN Patented Toe Protection where the shoe outsoles wrap up and over the toes for ultimate protection.