Here'so my thought on the outerwears. Yes they help protect the filter. It's not really that hard to take them off after a day of riding and rinse them under soap and water and let dry, reinstall. IMO if your hillclimbing you don't need the outerwears. Your not following behind someone with constant dirt sand Ect in the air infront of you. Also if your leading the pack your filters won't get as dirty if you were following someone. My filters have stayed pretty clean for a couple rides when i ride solo depending on conditions. I personally never let them get to the point where it made the bike run like crap from such a dirty filter
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