The Chameleon ISO from Merrell a pared-down warp speed expression of Chameleon adaptability and stability from a broad based sole to a flexible airflow mesh upper with molded protection at heel and toe and stability strut to anchor lacing. The Chameleon ISO features Slip Lasted Construction. Pigskin Leather Upper. Breathable Airflow Mesh Lining in Heel Area. Breathable Air Mesh Construction Treated with Aegis Antimicrobial Technology. Breathable Air Mesh Gusseted and Padded Tongue. Injection Molded TPU Counter reinforcement. Injection Molded TPU Instep Stability Arm. Protective Molded Rubber Toe Bumper. 4.5mm Ortholite Anatomical Footbed. Nylon 6.6 Injection Molded Arch Shank. Exposed In-Board Compression Molded EVA Footframe with Grade 2 Tapered. Nylon Insole Molded to Bottom. Merrell Air Cushion Midsole. 4mm Sole Lug Depth and Vibram Chameleon Speed Sole TC5Plus Rubber.