Stronger than expected.
Used these on a five-dayer in Kaweka Forest Park--steep country, fairly rough tracks, river walks. They stood up to hard use much better than I expected. Comfortable, and dried quickly for merino socks. The separate toes almost certainly prevented a couple of blisters, and allowed me to use my toes for stability better. These socks are much more durable than I expected--I thought they were town socks. I'll buy more, if Injinji are still making them when these wear out.