They do have 25x25 now, US$49. https://pinnonhatch.com/poultry-sup...iPEdIk3oK1pjCKchPZIBIMGbFaiv-vJEaAlfCEALw_wcB
They have two selling points - UV protection and it's
not nylon, it's polyethylene and polypropylene and will last a long time. You'll find nylon is cheaper though. I've had one net for almost three years so far and it's held up. I have two more nets but they're more recent.
I tried to cut a big one and found it difficult to do. They have instructions for dealing with it - and I forget if I tried to cut the length down or the width. My advice would be to first splurge on the 25x25 size and see what it's like to work with. Length would be easier than width to cut.
I did not lay it out properly, pinning it before I tried. I think it may need to really be evenly stretched and strongly pinned to get the absolute square full width. The width stretches out most of course but the length does some too. It has an elastic quality and is strong: the squares in these start out bunched together width-wise, so the shape is a long snake, the squares want to be a diamond shape. My "lawn" is not a golf course and all kinds of sticks and weeds and things caught it as I tried to manipulate it, and to be really square, the mesh has to have an even pull on it as it goes, attached every two feet or so? I tried to cut along a set of squares and I got 2 weird-shaped but still useable pieces. So the 2 subsequent nets I bought I've left alone. If it's more than I need I just leave it bunched, or extend their area with step-in posts under it.
On the other hand, there ARE true square-mesh nets that behave loosely, like a blanket. Mostly sporting nets I think - but they are way, way more expensive.
Here are some internet images - really tall posts under it so they can be widely spaced but still okay to walk under. The edges likely have insanely strong attachments for this size net.
I use these greenhouse frames to hold them up, since I have moved things around a lot within the larger electric fence perimeter, the 12x7x7 ones.
https://www.amazon.com/Strong-Camel...lpcontext&ref_=fplfs&smid=A3GE0Z66T0KKNN&th=1
I just lay the netting over them and stretch it out some and attach with carabiners to the frames. Not attached with a lot of pulling force, but some. Then I stretch the edges out, or I've stretched an end across and out over & into part of a lilac bush and maple saplings which hold it up, and I had some step-in posts getting there, and ultimately hold all the edges down with stones and firewood. The lilac bush is on the far right of the pic below, near the white waterer.
The idea is to keep the hens in and give them a chance against hawks. They have learned the difference between the white electric fence and the black netting when they're outside the netting but inside the fence with me. I hook up edges during those times so they can run back in when they want. If a hawk attacked unseen near a low edge - or attacked straight into the wall of the net - theoretically the hen could be caught, but if there's any squirming away to be had, the netting will help I hope. It's only pretty low near the edge of the net.
They love it under the lilac maple saplings