sneak·er·cul·ture : /ˈsnēkərˌ/ /ˈkəlCHər/
to have a strong interest in sneaker history, to seek out rare and exclusive sneaker collections, and to admire, collect – and sometimes re-sell – sneakers.
(Matthews, D., Cryer-Coupet, Q. & Degirmencioglu, N. I wear, therefore I am: investigating sneakerhead culture, social identity, and brand preference among men. Fash Text 8, 1 (2021).
sneak·er·head : /ˈsnēkərˌhed/
a sneaker enthusiast.
"Adidas gave the sneakerheads a little something to get excited about."
Definition from Oxford Languages