they just get clogged with a tons of mud. if you feel you need flaps get rally armor, if you actually take the car off the road, which im guessing you have to in alaska, ditch the plastic washers and get stainless steel ones. i ripped part of a flap at one of the holes, and ripped 2 of them off, found em luckily. with the steel washers, they are much more sturdy and shouldn't come off ever again. the rear bumper cover is nice, definitely a must have.