I’ve got some of those. The loop is for giving yourself wedgies for not riding gnar enough.
They’re very thin but great for keeping the spray off. I wear leg warmers under at the moment as they don’t provide any warmth. Quite a slim fit but stretchy material.
Odd fastening arrangement at the front. Short, high zip with a big flap which poppers over the zip. So no good for a quick wee without undoing the lot. Not a major problem, just, well, peculiar.
Couple of zipped thigh pockets. I keep my phone in one.
A couple of months use in the shittiest conditions, hose off, washing machine then tumble dryer a couple of times a week and holding up well.
No complaints for forty notes.