"Dad sneakers" refers to a type of athletic or running shoes that are considered uncool or outdated in style, resembling the shoes that many fathers used to wear in the past. Full definition
You've heard of dad shirts, dad hats, and now dad sneakers! (bestproducts.com)
We were happy to see dad sneakers, styled on male models, runway because it means we'll get to keep wearing them for a while. (whowhatwear.co.uk)
For those days when you're not feeling sandals, a pair of chunky dad sneakers makes the perfect contrast to all your summer dresses and skirts. (harpersbazaar.com)