Columbia Sportswear Heather Canyon Winter Boot (Toddler/Little Kid/Big Kid) 100% Synthetic Rubber sole Non-marking Omni-Grip rubber compound with a winter specific lug tread pattern for extra grip Molded nylon shank provides torsional rigidity and support Techlite molded shell provides cushion and protection in a lightweight and flexible shell Omni-Heat technology reflects natural body heat for added warmth