Black climbing jeans (slim fit) from the sustainable outdoor UK brand 3rd Rock ("Marple" model if you want to check on their website). High-quality, super resistant, very  confortable. They are so stretchy you can genuinely boulder/climb in these, but they also look great as everyday jeans (except that, unlike with normal jeans, you get to move freely in them :)).
Used but in great condition, from a pet- and smoke-free home.