I'm looking for a source of supply for getting a roll of 10 ft. wide x 100 ft. long x 7mm square butterfly netting to cover my cabbage plants from the cabbage worm. I use a hoop system so the 10 ft. width is required. It seems there are no U.S. suppliers for this product.

Not sure netting is the product that would work...
I think you are needing a traditional frost protection row cover.

I think the white cabbage butterfly could lay eggs through netting.