Hey Aaron,
My 2 cents! Great visualization, similar to what Matt Choto had on his portfolio. In terms of design skills I’d say you definitely are there. I’m not very familiar with the footwear industry, but it seems you have the conceptual skills. It’d be nice to see a raw prototype, shouldn’t be too complicated to 3D print the sole and laser cut the fabrics to fit your design. Not sure if you have any pattern-making skills but that a cool visual model would be beneficial.
However, at brand level, I see Under Armour as a much more functional and loud brand. The pattern in your concept looks soft and adaptable, I’d rather go for something more aggressive and technical. I’d also apply a bigger logo.
Good luck with the job hunt!
Cheers!
Alejandro