Comments: I have been a Kinvara fan since the Kinvara 2. I wore these Kinvara 4 for about 3 months/100 miles and the the mesh gave out near the pinkie toe of each foot. Running Warehouse replaced them for me at no charge. Same thing happened in the same place after about 100 miles again. My 13 year old runs track and chose Kinvara 4's - same thing happened to his. I think it is a weak spot in the mesh. I'm still in Kinvara fan and will hope the 5's address this issue.
From: Lisa, Fulton, MO, USA. May 7th 2014
Comments: Sneaker is only 3 months old and the mesh is torn away from sneaker. Would not recommned sneaker.
From: Tina, St. John's NL, Canada
Comments: I love this shoe, much like I loved the Kinvara 2. For some reason, the Kinvara 3 did not work for me, as I got a burning sensation and numbness under the balls of both of my feet. It was actually the first pair of running shoes that I ever returned. But I've had nothing but pure running pleasure, including with bare feet, in the Kinvara 4. Of note, I'm a lightweight, efficient, mid-foot striker, so I feel I am kind of the target audience for these shoes. I also feel the shoe has improved in terms of upper fit over the Kinvara 2; we'll see how the new sole wears--the only downside I found in the Kinvara 2s.
From: Seattle, WA
Comments: OVERALL: Kinvaras are classified as "neutral" but their substantial plate prevents foot-roll, and I would call these minimal-control shoes. I found these bulky when I first put them on, but got used to them after a few laps. They are essentially the same as the earlier Kinvaras: lightweight trainers for people who don't like trainers, and for people who do like trainers but need something lightweight for a long run. At first glance, these are about the same weight and heel-toe-drop as the Kinvara 3's. The drop is about an inch or so: quite a lot of build-up, to my mind, putting the shoe in the category of lightweight trainer rather than anything for speedwork or racing. For someone used to minimalist shoes like me, putting these on the first time is like wearing in cork wedgies.
PLATE: The Kinvara plate-mold has remained virtually the same since the first edition. The synthetic foam itself has supposedly changed between 3 and 4. I think it's supposed to be a little springier, but I can't detect a difference. I suspect the differences show up after about 200 miles.
UPPER: The noticeable difference is in the top. The Kinvara 4 looks much more structured. Where the Kinvara 3's forefoot was like a ribbed sock, the Kinvara 4's forefoot is restrained by a trusswork. Apparently some people felt the 3 wasn't structured enough. I suppose that if you get the size 10-1/2 because you have feet that are a tiny bit big for size 10 but really too small for 10-1/2, this extra structure will make the shoe feel a little less floppy. Otherwise I don't see the point.