With input from Chris Grenier, his pro model, the Diesel Hybrid offers a traditional lace boot with added heel lock down from the BOA® Hybrid Instep Fit System. A 3D molded tongue and Performance Backstay give this boot a flex that’s on the stiffer side of medium perfect freestyle. Heat moldable Intuition™ Team Fit liners provide perfect out of box fit. The STI Evolution Foam outsole provides of all-day comfort, all terrain traction, and keeps the overall weight of the boots light.