Dual Density (DD) Foam - A balance of comfort and performance, with the absolute best warmth. High Abrasion-resistant Textile Construction Non-slip Outsole Antimicrobial Lining Treatment Low-DD Toe Box 4mm HD Shim Insole 4mm HD Outsole 4mm MD J-bars for Ankle Support Dorsal Flex Zone Locking Speed Lace System Asymmetric Tongue Padding 3mm Extra Stiff Cuff / Ankle Reinforcement Webbing Loops for Easy On-Off