6-month review:
I am an overly picky customer in terms of quality checks. Sales people must be cursing me.
But even I am really happy with the superior quality of 777s-21 and definitely can recommend as a kick-off pair for IH first timers.
All the seams, details have been done at 11-out-of-10 quality. Neat and clean work.
I wasn't that lucky with 19L pair, had to return having some issues with inner seams, but will give 19L a try another time.
As for the 777s-21:
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the test I am constantly giving this is almost daily (average) 5-mile walks, up and down the hill, with multiple squats to lace up shoes or scratch my ankle. Usually only 2-3 hours a day, but pressure they experience is probably more than they would get from a 8-hour wear by a person with sedentary lifestyle. I turned them inside out and checked the seams (fly, inseams, outseams, etc.). They are still going strong, not even a sign of going sideways. Worth it's price and a good investment.
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After a prolonged 3-hour soak the fabric became denser, thicker and sort of rougher (only 3 hand washes so far). This affected the way they fade. Fades started popping up all over the surface. Not just honeycombs or whiskers. It became kind of uneven and sharper, which I like. Sorry, photos don't reflect the colors in full.
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I will keep on long-soak + hand wash practice until creases and fades set up, and then want to give them a good machine wash. For some reason I am into rather vintage fades.
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They did stretch in waist, but tend to get back if stay on the hanger for a couple of days. I would say width fluctuating back and forth based on frequency of use. This must be true about 21 oz, not sure how other fabric types act. But definitely they are very pliable and easy to wear, not that tight like used to do when I newly got them out of the package. Also no baggy saggy backside or knee bubbles. This is a pleasant surprise.