Saucony’s Kinvara series has developed a cult like following amongst lightweight and minimal fans. In May 2013, the successful 4mm drop shoe will be receiving an update with the addition of the Kinvara 4. Not a huge change from the popular Kinvara 3, but look for an improved upper design and the addition of a PowerGrid heel insert. The stripped down upper, increases breathability and has a much softer feel during foot flexion. Updating to Saucony PowerGrid cushioning will give a smooth transition from heel to toe. Look for the Saucony Kinvara 4 in May 2013 for $100.