The Metatarsus Insert for Sidi Crossfire boots enhances foot protection by reinforcing the boot's upper section. Specifically designed for the Crossfire 2, Crossfire 2 SRS, Crossfire 3, and Crossfire 3 SRS models, this insert helps protect against impacts and wear, providing long-lasting performance in rough conditions. It's the ideal replacement for maintaining the protective features of your boots. Sidi Crossfire Metatarsus Insert