Innovative Technology specifically engineered and designed to perform on wet ice. Unique polymer blend coupled with an advanced filler system / new processing technique.Paired with Vibram Icetrek, which yields Vibram’s best grip on dry ice.Engineered for low temperature use. Offers Vibram performance, quality and durability. Improved grip on cold, icy or snowy surfaces compared to existing Vibram soles. Thermochromatic lug on each sole which turns white to blue as the temperature near 0 degrees celsius (serves as an indicator to let the wearer know temp. is low enough for ice formulation).