Nike custom Metcon 4 shoes. Customized to gray and black with initials RO on the back. Unfortunately they ended up too narrow for my dad and couldn’t return. The Nike Free Metcon 4 combines flexibility with stability to help you get the most out of your training program. Updated "chain-link" mesh cools and flexes as you speed through agility drills, while support at the midfoot and heel braces you for your heaviest sets in the weight room.