With the Flex Runner 4, you'll always want to run. This slipper-like shoe is very easy to put on. ...With the Flex Runner 4, you'll always want to run. This slipper-like shoe is very easy to put on. The elastic straps provide a perfect fit. And the flexible grooves on the outsole allow the foot to move naturally. Ideal for finding your rhythm.
With the Flex Runner 4, you'll always want to run. This slipper-like shoe is very easy to put on. The elastic straps provide a perfect fit. And the flexible grooves on the outsole allow the foot to move naturally. Ideal for finding your rhythm.