Reebok Lightest, Most Flexible Sole. Reebok Yourflex Train 9.0 MT Men's Training Shoes in Black / Skull Grey / White / Pewter / Grey. You don't let anything hold you back, not even your shoes. Take your training to the next level in these featherweight Yourflex trainers. This sneaker comes equipped with the lightest and most flexible sole in Reebok training line, meaning you can tackle any workout without extra weigh-down. Neoprene and mesh upper for sculpted comfort and breathability. Low-cut design for ankle mobility. Microweb technology for midfoot support. Oversized delta logo on the side. Ultralight outsole for maximum flexibility. Color: Black / Skull Grey / White / Pewter / Grey.