How are these going to keep your feet warm during long hikes? Do you use them during Winter? Don't the toes wear out fast?
I can definitely see the comfort aspect, but I can't see myself wearing them for prolonged hikes or even in 32 F weather. Hmmmm...
What are they made of? And don't they increase the width of your feet inside the shoes?
EDIT
And NO, you can not keep me out of a socks thread!
I wear them hiking too. They saved my hiking I would say as I had a lot of blister problems before discovering Injinjis. The ones I have are thin (tan in color as well) so I use them as a liner sock with Vermont Darn Tough socks over them. The socks keep down friction between toes which greatly reduces blistering for me. It is the same principle as taping. I will sometimes use lubrication or powder as well inside the socks. (See Fixing Your Feet)
Injinjis have no seam - they are one unit from bottom to top. They make several models afaik, and the ones I have are a synthetic of some kind like Coolmax or similar - there is no tag in the sock as I just checked a pair. I've put over 3 hiking seasons on my socks and they are just now to the point where I need to order some more. They are quite durable. The toes do not wear out in my experience.
As far as changing the foot volume, sure it does to some extent. It is the same thing as wearing a liner sock and an oversock on top like many runners do. My hiking shoes are Lowas and have enough volume to take the two socks. I also size my hiking shoes about 1 size up as feet swell under hiking conditions. Let me know if I can answer any more questions.