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 stable of athletes for the growing shoe brand. For his first several seasons, he was the face of the revamped Anatomix Spawn line.

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, before signing with Under Armour.