Worn long enough to get me thorough a one month trial at a CrossFit gym. Have a lot of life left in them. Putting you in a more natural position, the 20v6 gives athletes a more ground feel during strength training. A Vibram outsole increases durability and a REVlite midsole provides lightweight responsiveness. The burrito tongue and new asym collar with molded foam allows for a more natural heel fit. Meta Support internal framework enhances fit for a secure feel No Sew Overlays REVlite midsole delivers incredibly lightweight cushioning