The new Challenger 7 has been completely redesigned, with a mix of road and trail use. Hoka combines a simplified mesh upper with a soft new foam, Hoka raised the sole for better feel and added a proprietary rubber compound to the bottom, along with a redesigned outsole for best-in-class all-terrain capabilities. The outsoles, inspired by all-terrain tires, have smaller, densely spaced grooves in the center and larger, more aggressive grooves around the perimeter for better grip on uneven terrain.