Made my own out of baling twine
I have only oat hay and alfalfa available, so I did 2 1/2" holes.
I weigh the full nets, 24 hours later what's left in them, add the alfalfa( not in the net), and the small flakes I put on the ground in the run-in for when the bugs are too bad.
I've been weighing now for about 2 weeks, and they went from 25 lbs each down to 15lbs each
I do feed a little, about 11/2lbs, soaked alfalfa and one resp. 3 lbs safe choice too.
Im currently working on new nets with 2" holes, now that they know how it works.
Oh yeah, happy, very calm and relaxed horses, too