On a lark I picked up some of the size XL zpacks (I wear a US M12). I can’t begin to describe how dumb these things are. They fit like the pajama feet we had as kids on our onesies. It’s like wearing swim flippers the way the broad toe flap catches on the ground. They might be fine standing around on level ground but they would be awful walking on even a mild side slope since there is zero structure to keep your feet from sliding around.
Nearly useless. Going back.
Ymmv.

