Very simple and basic and seem to work OK. However, the hook to connect to the loop on the trousers is pretty poor and slips off every time they're not under tension. A double hook, like those on Lowe alpine packs would have made this much better.

Well, they are braces and work as advertised. They also fit the old Latok waterproof trousers, which makes for a nice upgrade (together with patching all the holes from crampons).