Nike Zoom Flyknit Streak 6

Comfortable, light, not bulky. Great for workouts. I use them for everything because I prefer a less bulky shoe in general. The upper usually rips on the sides after about 800-1000 miles of running

I've run in just about every version of the Streak, including the LT versions, and this is my favorite update. The flyknit upper is the best fitting upper I've experienced since the original. I expected to see some compromise in lateral stability due to the socklike upper, but that hasn't been the case. I've worn this shoe for a 1 mile Road Race, a 5k Road Race, several interval session (both track and treadmill), and even a Spartan Stadium Race. The shoe felt plenty fast and responsive for the 1 Mile, while having enough cushioning and stability to handle a 30 min Spartan race (box jumps, lateral movements, sharp turns, and thousands of stairs). The foam bottom on the inside on the heels are a bit beat up, but that is pretty acceptable seeing as no racing flat is designed with obstacle courses in mind. I could race in this shoe up to a half marathon if need be, and I'm not the lightest runner (6' 170#).

I really like the lacing system which locks down the entire foot, even the heel, through the use of strategically placed threads in the flyknit that pull the entire upper tight around your foot when the laces are tightened. I can crank the laces as tight as I need to without feeling crazy pressure or hot spots. Nike nailed it with the update to this iconic flat.

Fits to size. The Flyknit is extremely durable, especially compared to the regular Nike Zoom Streak 6 that has a lot of problems with the durability of the upper. I've done almost every workout (twice a week), plus some long and recovery runs in these shoes for 5 months. No signs of tearing and limited signs of wear on the sole. It's light and responsive, locks the heel heel down we'll, and is pretty comfortable given it's weight.

I have done most of my training in Lunaracers for the past 7-8 years, but needed to find a replacement after they were discontinued. The Streak 6 provides a similar fit but with a firmer and less substantial feel. I really enjoy them for tempo work and would be comfortable using them for road races 5k to marathon. I also do a lot of running on trails and the grippy forefoot held up admirably. However, the Streak 6 was not substantial enough for me to do long runs (90 min to 2 hrs is about the max that they feel good for me) and they fall short of the Lunaracer in that regard. The Streak 6 is a good shoe to have in your quiver, but it's not the all-around stalwart that the Lunaracer was.

In terms of mesh vs flyknit: mesh will give you a more locked in fit, but flyknit is more durable, especially in wet conditions. The mesh will tear easily on steep downhills if it is wet.

light responsive, just enough cushioning

I am a sprinter/triple jumper and I use this shoes exclusively for track workouts. The shoe's lockdown is uncanny and keeps your foot in even on tight indoor turns. It is responsive, it isn't supposed to be soft. The outsole has some rubber overlays that help with grip a little. Overall awesome track workout shoe.