The Fanatic is Merrell to the max. To satisfy the most aggressive trail runners, we took our groundbreaker trail technology to another level, starting with a nearly stitchless but decidedly rugged upper design that includes Aegis™ antimicrobial lining. Then extended our visible, tubular Trailspring™ support to the forefoot as well as the heel to add alignment to structural cushioning. Lightness rules: from a skeletal molded arch bridge to Vibram® Feather Speed™ sole. End Uses: All season adventure racing on moderate to backcountry terrain. Best worn with thin, high-performance sock. - Stability Plus Groomed Trail/Hybrid Shoe - Merrell Exclusive Trail Balanced™ Last - Slip Lasted Construction with EVA Insole - AirMesh Upper with TPU Welded Trim - Dri-Lex® Comfort Zone Lining with Aegis® Antimicrobial - Nearly Stitchless Upper Design - Kevlar® Lace and TPU Molded Lace Lock System - Heel Securing Top Eyelet System - Omni-Fit™ Lacing and Bellows Tongue with Lace Keeper Flap - Ventilation and Drainage System in Forefoot - Forefoot Protection Upper Design with Gaiter Hook - Anatomical Ventilated EVA Footbed with Etc.® Anti-Friction Mesh Lining - Trail Alignment System Dual Density Molded EVA Footframe (men) - TrailSpring™ Injection TPU Structural Cushioning and Support System in Heel - TrailSpring™ Injection TPU Structural Cushioning and Alignment System in Forefoot - Gaiter Strap Channel at Arch Bridge - Air Cushion® Midsole - 4mm Sole Lug Depth - Vibram® Feather Speed™ Dual Density Outsole/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