I own a fair amount of Kuiu and Stika. The Kuiu attack pants are the best hunting pant bar none on the face of the planet. I have worn the first generation of attack pants for years and I've worn them hard. I have yet to tear a hole or rip the crotch in fence crossings. I have a couple pairs of the new generation solid colors I wear to the office. The solids have the zipped vents on the thighs, but I've never used them. They are the most comfortable, breathable, flexible, tough hunting pant out there. And I own the Stika mountain and ascent pant as well. I personally don't care for the Kuiu colors, but I can tell you this, it will not fade over time. I have a few of their tops, but I do like the Stika tops better, particularly the waterfowl camo for coyote huntin. Probably the best piece of Kuiu gear is the bino harness. I've used them all and this one is the lightest and most comfortable to wear. Plus you can up clip them and hand the binos to your handicap friend who forgot his (we all have one of those partners).
The downside is you need to place the order. They won't charge you until they ship, but it may take months before they get them back in stock. It is an athletic cut on the clothes. Most guys upsize by one or simply order two different sizes and return the one you don't keep. IMO there is a reason Kyptex, Kings, Predator, Firstlite, and all the others are copying what Stika started and Kuiu is taking to another level. It won't help you kill anymore animals than a pair of jeans, but if you like to be comfortable and only take one pair of pants on a pack hunt these are it.
Look at it this way, the attack pants will last longer than the $600 you just dropped on your last FOXPRO, and you will still be wearing them when you drop another $600 on your next FOXPRO.