Home Nike Nike Free Powerlines+ ‘Challenge Red/Black-Cool Grey’ Nike Nike Free Powerlines+ ‘Challenge Red/Black-Cool Grey’ By Brian Betschart - Jun 23, 2012 Hitting Nike.com is the latest edition of the new Nike Free Powerlines+. The Challenge Red/Black-Cool Grey colorway of the comfy minimalist runner is now available for $110. RELATED ARTICLESMORE FROM AUTHOR Introducing the New Nike Air Max Viva in ‘Iron Grey’ Nike Waffle Trainer 2 Returning Soon Nike Air Tuned Max OG ‘Celery’ Official Images Follow Us912,700FansLike447,804FollowersFollow226,375FollowersFollow136,000SubscribersSubscribe Recent News First Look at the Air Jordan 6 ‘Electric Green’ Mar 3, 2021 Air Jordan 13 ‘Court Purple’ Releasing on Christmas Day Mar 3, 2021 Detailed Look at the Nike SB Dunk Low ‘What The P-Rod’ Mar 3, 2021 First Look at Zion Williamson’s Jordan Z Code Signature Shoe Mar 3, 2021