Under Armour signs Bryce Harper to multi-year extension: Harper One spikes to be released in July

Under Armour has signed a multi-year extension with Bryce Harper, the sports apparel company announced Tuesday.

Harper, the National League MVP last season, has been with Under Armour since April 2011. Terms of the extension weren't revealed.

Harper, 23, expressed his happiness in an InstaGram post:

"No other company I would want to be with! Can't wait to show the world what is coming..lets have some fun! #Family #TeamUA"

Harper will have his first signature spikes -- the Harper One -- released in July.

He will also continue to be one of the most featured players in marketing campaigns.

"Under Armour has been one of my biggest advocates since I began my professional journey, and I can't wait to share what's next with the fans," Harper said in a company press release.

Under Armour has emphasized landing young sports stars to be its signature promoters. Other athletes aligned with Under Armour include NBA MVP Stephen Curry, NFL MVP Cam Newton, PGA Tour Player of the Year Jordan Spieth and Olympic swimming icon Michael Phelps.