I picked up a pair of these to replace my Pegasus 40's on regular training runs and must say I'm really pleased with them.What are they like to wear?They seem ideal for easy paced training runs and are cushioned enough for regular use, really "taking care" of your feet. They feel very stable underfoot with a nice heel to toe rocking motion and good grip which seems, to me at least, to encourage better running form.What about the fit?It was recommended to go up half a size and I'm glad that I did. Nike are usually spot on size wise but these do feel fairly closed in around the toes and the upper is snug against the foot.Anything else to note?That snug upper does make these Infinity Run Flyknit 4's a warm shoe. Not overly so but worth noting.Final ... MoreI picked up a pair of these to replace my Pegasus 40's on regular training runs and must say I'm really pleased with them.What are they like to wear?They seem ideal for easy paced training runs and are cushioned enough for regular use, really "taking care" of your feet. They feel very stable underfoot with a nice heel to toe rocking motion and good grip which seems, to me at least, to encourage better running form.What about the fit?It was recommended to go up half a size and I'm glad that I did. Nike are usually spot on size wise but these do feel fairly closed in around the toes and the upper is snug against the foot.Anything else to note?That snug upper does make these Infinity Run Flyknit 4's a warm shoe. Not overly so but worth noting.Final thoughts?This is a fantastic choice for your day to day training runs and feels very capable of eating up the miles. Lace 'em up and off you go! Highly recommended.

I like this generation, but I’m a bigger fan of the Infinity 2 for reasons that may or may not be important to you. Regardless it’s a very worthy shoe.I’m generally not a fan of flyknit for any athletic shoe due to the lack of support. While very comfortable, you can really only run in a straight line. Tight turns are totally out of the question and even moderate curves I can still feel my foot sliding in the shoe and edging toward a rolled ankle. The 2 also had a supple upper, but there was definitely more support, so turns were much more manageable. I absolutely would not ever recommend taking these on trail runs. I think you’re asking for trouble if you do.I like the soles on these better than the 2, though. Full sheet of rubber coverage on the bottom with ... MoreI like this generation, but I’m a bigger fan of the Infinity 2 for reasons that may or may not be important to you. Regardless it’s a very worthy shoe.I’m generally not a fan of flyknit for any athletic shoe due to the lack of support. While very comfortable, you can really only run in a straight line. Tight turns are totally out of the question and even moderate curves I can still feel my foot sliding in the shoe and edging toward a rolled ankle. The 2 also had a supple upper, but there was definitely more support, so turns were much more manageable. I absolutely would not ever recommend taking these on trail runs. I think you’re asking for trouble if you do.I like the soles on these better than the 2, though. Full sheet of rubber coverage on the bottom with thin nubs for extra wear resistance. The 2 has a cool design on the sole, but I knew I was going to wear through, which I eventually did. I think these will last quite a bit longer.Lastly, the Infinity 2 had a rounder shape to the foam in the sole that lent itself to rolling weight transfer if you ever find yourself heel striking. The 4 also has a round shape, but the center has a longer flat patch which feels more stable. Not sure I’d call it better or worse, just different.Either way, these are still great running shoes and looking forward to logging a few hundred miles on ‘em

Pros:ComfortableLightweightVery cushionedBig toe boxGood heel lockFeels like you're barefootCons:Can be a bit uncomfortable after wearing for a while (for me on the top of the foot)Not the best for faster pace runs (in my opinion)Arch support is a bit too shallow for my feetI got these shoes as a daily trainer for track practice a few months back. I have been wearing them to school often and love how comfortable they are.Normally when running, I like to tie my shoes/spikes pretty tight. The tongue on these shoes have a bit of a tighter elastic part that goes across the hinge on the front of my foot, right at the top of the laces. While this does help a lot with keeping my foot secure, it does hurt a little when I tighten my shoes too much. As for daily ... MorePros:ComfortableLightweightVery cushionedBig toe boxGood heel lockFeels like you're barefootCons:Can be a bit uncomfortable after wearing for a while (for me on the top of the foot)Not the best for faster pace runs (in my opinion)Arch support is a bit too shallow for my feetI got these shoes as a daily trainer for track practice a few months back. I have been wearing them to school often and love how comfortable they are.Normally when running, I like to tie my shoes/spikes pretty tight. The tongue on these shoes have a bit of a tighter elastic part that goes across the hinge on the front of my foot, right at the top of the laces. While this does help a lot with keeping my foot secure, it does hurt a little when I tighten my shoes too much. As for daily wear, these shoes feel great. It seriously feels like wearing a sock.These shoes replaced my Pegasus 38s (I was convinced I could not find a better running shoe then my pegs) and so far they have held up very well. The biggest difference between the two pairs is that the Pegs felt like a lot faster tempo trainer than these Infinity Runs.I am a 400/800 runner in high school and our workouts normally consist of 150-300m fast pace repeats and possibly a mile or two easy run every once in a while. Comparing the two shoes, the Pegs would definitely be better for my faster workouts and the IRNs would be better for slower, longer runs (the Pegs were still great for the mile jogs).