I'm behind the ball on this one. Months ago, the nice folks at Injnji sent us RR&RS bloggers a number of toesocks to try out. Both Eric and Joel have posted their reviews and it's time for me to chime in.
I started with with the Midweight Performance Series and, to be quite honest with you, didn't like them all that much. The construction of having a sleeve for each toe felt awkward, and the fabric between the toes rubbed together and almost gave me a blister on my middle toe. I also found them to be a bit too warm for anything other than winter running - but I tend to be hot as a default. The instructions did say to give yourself some time to adjust, and so I tried these socks a few times, but never really warmed up to them.
Original Weight Performance Series socks. I'm sorry I waited, because the weight change made a significant difference! The thinner material felt much more natural on my toes and didn't rub together nearly as much. They were cooler, wicking moisture more effectively for me, and fit much better in my shoes (which I like to lace up really tightly). It was wearing these socks that I discovered the fun of spreading out your toes when running, something I can do much easier in the larger toe box of my Saucony Guide 3s rather than my usual shoe (Brooks Adrenaline 12). I wear them regularly now, when trail running in particular, and enjoy the subtle increase in control that it gives me.
I was impressed with the original weight socks, and want to thank Injniji for sending them along. They're high-quality socks that are now a regular part of my running wardrobe.
Review: Injinji Toesocks (outdoor, original weight, crew)
Review: Injinji Toesocks
Review: Feetures! Elite Socks
Review: Injinji Toesocks (outdoor series)