Five Ten Kestrel BOA Mountain Clipless Shoes - Women's Warm Clay/Wonder Taupe/Core Black 9. Push your limits in the great outdoors. These Kestrel BOA Mountain clipless shoes feature the BOA Fit System for a custom fit. Seamless overlays offer abrasion resistance through rough terrain. The clipless shank is compatible with all mountain bikes. Micro-adjustable dial-based BOA Fit System Synthetic upper with seamless overlays. Impact-resistant toe box. Non-slip heel cup. Clipless shank