The Green-Net is a fibrillated synthetic fiber made from 100% recycled polypropylene resin, used to control cracking and increase the recycled material content of the concrete. It is typically used at 1.5 lbs./cu.yd. to control shrinkage and temperature cracking as an alternate to non-structural wire mesh reinforcement. Forta. 800-245-0306. www.forta-ferro.com