Folks who regularly ride in monsoon conditions should probably look for an air cleaner with a real cover and not one with an exposed filter element. While the rain socks will help repel small amounts of moisture, they were never meant to keep water out during a major downpour. Btw, if you're riding in a monsoon, how are you able to see where you're going, and equally important, how are the other folks on the road able to see you? My advice, when the rain starts get off the road and seek shelter. Bikes are not safe in heavy rains.
The following is from the K&N site concerning their rain socks (they call them wraps):
"DryCharger® - K&N DryChargers are manufactured from a durable polyester material and are pre-treated with a proprietary hydrophobic process designed to prevent splashes of water or mud from saturating your K&N air filter. The DryCharger will also stop small dirt particles; yet add little restriction to the airflow of the filter. Please be aware the DryCharger is water repellent, not water proof. Depending on conditions and usage the water repellent treatment is good for 1 to 2 years."
JMHO - Jerry