Don's sacrifice comfort during your workout. With the Nike Flex Trainer 4, you can take your workout to the next level with superior comfort and control. Mesh and foam upper provides breathabilty and support. Phylon™ midsole provides lightweight cushion. Midsole wrap in forefoot enhances support and stability. Engineered multidirectional flex grooves enhance flexibility specific to training. Minimal rubber pods provide traction. Low. Wt. 6.7 oz.