Combat Sports has come out with their new shin guard that is built specifically for MMA and grappling. The Gel Shock shin/instep guard is designed with the infused gel lining to ensure the best comfort and protection.
There is a neoprene reinforcement that covers the calf, which makes the guard very stable and locked down to prevent any shifting during vigorous grappling. (yes, vigorous) The leather striking outer surface will prove to be very durable and reduce the wear and tear. At about $60 the Gel Shock Shin Instep Guard is one of the top shin guards you can get.