The Overdrive by Merrell has trail running technology that brings some serious swift, keeping adventure racers centered and efficient to maintain speed over changeable terrain. Proprietary TrailSpring™ design positions visible tubes bisected by support beams in a full-length TPU plate to inhibit overpronation and cushion heel-strike. Trail Balanced™ last with integrated arch bridge stabilizes the heel while freeing the forefoot for easy toe off. Both quick-cinch air mesh upper and Merrell Air Cushion® sole (with Q-Form™ stride alignment for women) drain readily and are gaiter-compatible. Vibram® Full Speed II™ sole features heel-centering cutaway design and flex grooves for propulsion at the forefoot. End Use: Adventure racing and trail running on moderate to backcountry terrain. - Neutral Trail Shoe - Merrell Exclusive Trail Balanced™ Last - Combination Lasted Construction - AirMesh Upper with Synthetic Leather Trim - 3m™ Scothlite™ 360° Reflective Trim - Kevlar® Lace and TPU Molded Lace Lock System - Bellows Tongue with Protective Foam Insert and Lace Keeper Pocket - Forefoot Protection Design with Gaiter Hook - Ventilation and Drainage System in Forefoot - Anatomical Ventilated EVA Footbed with Etc.® Anti-Friction Mesh Lining - Dual Density Molded EVA Footframe (men) - Q-Form™ Triple Density Compression Molded EVA Footframe (women) - Trailspring™ Injection TPU Structural Support, Alignment and Cushioning System - Gaiter Strap Channel at Arch Bridge - Air Cushion® Midsole - 5mm Sole Lug Depth - Vibram® Full Speed II™ Dual Density/TC5+ Rubber - Vegan Friendly Footwear Men's Weight: 1 lb. 9 ozs. Women's Weight: 1 lb. 6 ozs. Men’s Sizes: 7-12,13,14,15 Women’s Sizes: 5-11