It’s the Mizuno Wave Bolt 2! I first saw this one (the women’s version) on Rachael Grinham. But this is the men’s version.
They have a black and white one:
Photo via Amazon.com
Buy (US): amazon.com
And a funky blue and red one:
Photo via Amazon.co.uk
Hope everyone had a nice winter break. Looking forward to a good 2014.