STEEL BLUE 312630 - Sothern Cross® Spin FX™ Ankle BOA® Safety Boot - Wheat. The Southern Cross® Spin-FX™ is up to the challenge. Powered by the BOA® Fit System, the unique Spin-FX™ is designed to enhance performance and comfort. Made up of 49 strands of stainless steel (7 bundles of 7), braided together, injected and wrapped with nylon, the system is...