The Witness from Merrell a snug athletic fit is achieved using a slip lasted construction method. For maximum control and fit a Kevlar lace and TPU lace lock system cinches down the foam protected bellows tongue and an In-Board EVA footframe cradles the foot. A sticky Vibram sole supplies the traction. The Witness features Slip Lasted Construction. Nubuck Leather and Synthetic Leather Upper. Breathable Polyester Mesh Aegis Antimicrobial Lining. Breathable Padded Tongue. Kevlar Lace and TPU Molded Lace Lock System. Bellows Tongue with Protective Foam Insert and Lace Keeper Pocket. 4.5mm Ortholite Anatomical Footbed. Nylon 6.6 Injection Molded Arch Shank. In-Board Compression Molded EVA Footframe. Merrell Air Cushion Midsole. 4.5mm Sole Lug Depth and Merrell Axis Vibram Sole Sticky Rubber.