Medium weight ag fabric. I can buy it here and save shipping or get it through several catalog sources. It lasts several seasons with care and can be cut into smaller pieces when worn. Smaller squares are used to cover squash, pumpkins and the like from vine borers.
Ok, I think that is similar to the row covers that I use. I get 85% sun and 4 degrees of protection when the temps are low.
Meant to ask about cucumbers. Does it do any good with respect to cucumber beetles?