In August 2017, Dennis Smith Jr. finally signed an endorsement deal with a major brand, choosing Under Armour, for a rumored $2M per year. The dynamic guard joined Josh Jackson and the Curry brothers as an exciting new face for the growing shoe brand. He was seen in the Drive 4 for much of his rookie season and showcased the new Anatomix Spawn Low in his sophomore season.

Drafted 9th overall in 2017 out of NC State, Smith wore adidas Dame 3 shoes as part of the 2017 March Madness tournament. During his highly hyped Summer League performance with the Mavs, Smith impressed with a cool blue pair of Jordan Super.Fly 5 shoes.