The NFL’s uniform policy really doesn’t make a lot of sense when you sit down and read it.
Some of the policy reads.
Shoes must be of standard football design, including “sneaker” type shoes such as basketball shoes, cross-training shoes, etc. Each team must designate a dominant base color for its shoes, either black or white (with shoelace color conforming to the dominant base color of the tongue area of the shoe). Each team must also designate one of its Constitutional uniform colors as a dominant team color for its shoes. Each team must also designate one of its Constitutional uniform colors as a secondary team color for its shoes.