TerraSpring Pro

Built for the K4 user who runs job sites, plays rec-league sports, or simply refuses to slow down, the TerraSpring Pro stacks vertical shock absorption and axial torsion control on top of a high-output carbon base. Ground reaction spikes that normally travel straight into the socket are absorbed distally, protecting skin over long, hard days.

Three independent elements do the work: a carbon heel-and-toe spring set, a coil-over urethane shock with 12 mm of travel, and a torsion core allowing 20 degrees of rotation. The package weighs 980 g at 27 cm, stands 185 mm tall, and is rated to 166 kg across sizes 24–30 cm.