The Keegan features a proprietary Design & Innovation Award winning mono-directional shank which is stiff over the pedals but allows you to walk naturally. It also reduces vibration, gives more pedal power, and helps with hard landings or impacts. Mixed with our second generation Intact® Rubber with a Shore A of 60 which is soft and tacky yet durable and other protective / reinforced features, the Keegan does not disappoint. Available in Mens sizes 7-13