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This trail engine runs smooth and efficient without knocking, overheating or overload. The Octane by Merrell incorporates significant elements of Merrell trail technology, from heel/toe Trail Balanced™ last to dual-density Trail Alignment footframe and acclaimed Merrell Trailspring™ tuned tubular supports system. Closefitting airmesh upper vents and drains on demand. A Vibram® Full Speed II™ sole centers and the heel and encourages forefoot propulsion. End Use: Adventure racing and trail running on moderate to backcountry terrain. – Neutral Trail Shoe – Merrell Exclusive Trail Balanced™ Last – Slip Lasted Construction with EVA Insole – AirMesh Upper with Synthetic Leather Trim – 3m™ Scothlite™ 360° Reflective Trim – Bellows Tongue – Ventilation and Drainage Upper Design – Forefoot Protection Upper Design with Gaiter Hook – Anatomical EVA Footbed – Trail Alignment System Dual Density Molded EVA Footframe (men) – Q-Form™ Triple Density Compression Molded EVA Footframe (women) – Injection TPR TrailSpring™ Structural Cushioning and Support System – Gaiter Strap Channel at Arch Bridge – Air Cushion® EVA Midsole – 5mm Sole Lug Depth – Vibram® Full Speed II™ Dual Density/TC5+ Rubber – Vegan Friendly Footwear Men’s Weight: 1 lb. 6 ozs. Women’s Weight: 1 lb. 4 ozs. Men’s Sizes: 7-12,13,14,15 Women’s Sizes: 5-11