Designed to fit Sinister Diesel cold air intake filters, this pre-filter sock provides a tight, secure fit to help keep your intake system clean and running strong in challenging environments. Blocks out sand, dust, and other fine particles before they reach your main filter—ideal for off-road, desert, or construction site use where air quality can be rough on your intake system. Helps extend the life of your air filter by reducing the amount of debris that collects on it, saving you time and money on maintenance and replacements down the road. Maintains airflow and performance while adding an extra layer of protection for your diesel engine, all without restricting intake efficiency or causing unnecessary drag. Quick and easy to install—just slip it over your filter and you're ready to go. No tools are needed, and it's just as simple to remove and clean for repeated use in tough conditions.