Sumitomo Chemicals Olyset Net has revolutionized the global fight against malaria. This Olyset Net kills and prevent mosquitos in indoor and outdoor. Sumitomo Chemical’s Olyset Net has revolutionized the global fight against malaria. Protecting nearly 800 million people since it received WHO recommendation in 2001. This netting is highly durable and award-winning for its long lasting insecticidal net, which uses hybrid polymer and controlled insecticide release technology to repel, kill and prevent mosquitos from biting for up to five years.