![Amazon.com | Nike Men's Flex Control TR4 Cross Trainer, Black/White-Dark Smoke Grey-Smoke Grey, 7 Regular US | Fitness & Cross-Training Amazon.com | Nike Men's Flex Control TR4 Cross Trainer, Black/White-Dark Smoke Grey-Smoke Grey, 7 Regular US | Fitness & Cross-Training](https://m.media-amazon.com/images/I/51EbaPUtTpL._AC_SY675_.jpg)
Amazon.com | Nike Men's Flex Control TR4 Cross Trainer, Black/White-Dark Smoke Grey-Smoke Grey, 7 Regular US | Fitness & Cross-Training
![Amazon.com | Nike Men's Flex Control TR4 Cross Trainer, Black/White-Dark Smoke Grey-Smoke Grey, 7 Regular US | Fitness & Cross-Training Amazon.com | Nike Men's Flex Control TR4 Cross Trainer, Black/White-Dark Smoke Grey-Smoke Grey, 7 Regular US | Fitness & Cross-Training](https://m.media-amazon.com/images/I/618IK6sSdmL._AC_UY1000_.jpg)
Amazon.com | Nike Men's Flex Control TR4 Cross Trainer, Black/White-Dark Smoke Grey-Smoke Grey, 7 Regular US | Fitness & Cross-Training
![World Athletics denies tipping off Nike over new running-shoe regulations | Athletics | The Guardian World Athletics denies tipping off Nike over new running-shoe regulations | Athletics | The Guardian](https://i.guim.co.uk/img/media/8dd989f70bc471a8dd2970d87c5338501bb88af1/142_217_3250_1951/master/3250.jpg?width=1200&height=1200&quality=85&auto=format&fit=crop&s=98149160ba44c2da042cd76503c05c40)