Meet The Trainer Versatile Enough To Withstand The Rigors Of A Fast-Paced Group Class Or A Heavy Day In The Weight Room. Equipped With A Flat Heel, High-Abrasion Materials And A Flexible Sole, It Provides Comfort And Support That'S Ready To Hit The Gym. See The Specks On The Outsole? That Means It'S Constructed With At Least 8% Nike Grind Material, Made From Scraps From The Footwear Manufacturing Process.?