The 9p Industries filter sock protects the intake from dust, small debris and water. Hydrophobic filter socks are a great way to reduce the amount of water that commonly rusts filter mesh and ultimately softens and tears the filter material. It will not, protect against hydrolock if you go through an extremely deep puddle. What it can provide is a buffer against water that gets sprayed into the wheel well keeping the filter clean and dry for years, reducing the need for a replacement.