I have used slow-feed hay nets since the idea first appeared online from the Swedish Hoof school! Have had the greatest satisfaction for my minis using Freedom Feeder nets, a soft, knot-free type. I placed eye bolts on the sides near the bottom of oval 'tub' type feeders, use carbiners to snap the hay net inside the feeder. placed on mats(both inside and outside), and sweep the mats twice daily. Net for my adult mini is 1" openings; he might do even better w/ 1/2", as he is very proficient at eating from the net. Haven't introduced my yearling filly to net feeding yet, as she has a very 'busy' exploring mouth,is so far a 'pawer' and prone to putting a hoof into her feeder(and eats enough for two horses, a goodly portion of it alfalfa, which doesn't work well in slow feed nets)...will introduce her all in good time. My 'big' horse uses a Squires poly net, named the 'greedy eater', about 1-1 1/4" openings.He does 'bite' his net and shake it; so the 'freedom feeder' didn't work for him; he quickly managed to bite a hole in it! I tie his net to the panel fence, above an oval tub type feeder..but not 'high'(he is always barefoot, and is not a 'pawer'.)He is also on mats. There is VERY minimal waste of hay and/or hay ending up on dirt. Have found it is often necessary to start with larger net openings so horses can learn to use the net, then switch to smaller openings. Of course, if your horse has ANY likelihood of getting a hoof in a net, you must figure out how to place it so that CANNOT happen; this might include building a slow feed BOX feeder with sides impossible to paw over, and using a suitably-sized fastened-down net covering for the hay.(I don't like making a horse reach UP for its hay; it's such an unnatural position.)All that said....I am a BIG fan of slow feeding, and feel it can be a BIG help in creating a more 'natural'(and better for the horse's gastrointestinal health!)eating situation, and thus well worth the extra effort .