The mix of athletic wear and and high-end streetwear is, for a lack of a better term...
Things that one would be doing in order to efficiently wear BOTH athletic & streetwear:
Running a fast break, while simultaneously looking longingly in the general direction of a camera for a look book shoot.
Sitting at a cafe, cross-legged, while performing squats.
Working on your Instagram follows
while working on your cardio... in the woods.
(THIS kid looks good though...)