These KALAS Z3 Project overshoes are designed for time trial and the fastest road race finishes. Designed using Vorteq’s patented double-layer technology, these are our fastest overshoes ever. Wind tunnel-proven and tested in some of the biggest races in the world, they feature a completely redesigned pattern to deliver a better fit and a new double gripper to keep the overshoes in position. For best results use in combination with PRO PROJECT 1.0 aerosocks. We also recommend a revision to how these overshoes are put on. Put the overshoe on before the shoe and pull the overshoe up beyond the ankle. Then put on the shoe and pull the overshoe down on top of the shoe. Use Case: TT, RR, Summer Aero Tight Fit