Five Ten Kestrel BOA Mountain Clipless Shoes - Men's Core BLK/Gray Six/Gray Four 11Five Ten Kestrel BOA Mountain Clipless Shoes Mens Core Black Gray Six Gray Four 11. These mens Five Ten clipless bike shoes are built for intense pedaling. The BOA Fit System offers on the fly adjustments. A Stealth Marathon rubber outsole balances grip and durability. The impact resistant toe box adds protection. Made with a series of recycled materials this upper features at least 50% recycled content. This product represents just one of Five Tens