Do not buy these if you are a fan of the Structures. I have been wearing them since the 11's and have always been a fan. The 17's are the perfect shoe so I thought &#34;why not try the 18's&#34;. Right out of the box the shoe was a bit snug and when I took it on my first run it was rigid and uncomfortable. The redesigned upper is not very attractive and the redesigned sole is a nightmare.... Hopefully Nike can correct their mistakes on the next version, until then I am stocked up on the 17's.