Justin Jefferson was not only the best player on the field for the Vikings this weekend -- he was also the most swagged out ... 'cause he rocked a pair of Swarovski crystal-filled spikes that were AWESOME!!
JJ hit up celeb shoe artist Mache for the pieces earlier this season -- and the dude went crazy on the spikes ... icing out a pair of all-black cleats for the Minnesota star to wear against the Seahawks.
On one of the shoes, Mache threw crystals on a big jet -- a nod to Jefferson's "jet" nickname (as well as his sweet diamond pendant).