Irrigation Socks: Irrigation erosion-control socks are manufactured onsite at Cobco and stocked in several sizes, materials and configurations. Custom orders are also available. Most socks are used to slow the velocity of water at the outlets on irrigation pipelines. This prevents washing out basins where the water enters a furrow. Most socks are held in place by aluminum rod CLIPS separately by Cobco. Some farmers use socks with Cobco POLYPIPE, while others use socks with gated aluminum pipe or PVC pipe.