ALL TERRAIN, ALL THE TIME. Put on your shoes, take your bike and go for your Saturday morning walks on the nearby bike paths. The all-new Shuttle Flat mountain bike shoe is designed to be as versatile and ready for anything as you are. Featuring an ultra-durable dual-density rubber sole with an exclusive GRIPR rubber compound in the pedal contact area and an ultra-cushy internal EVA midsole, the Shuttle Flat is guaranteed to become your shoe of choice. .