I assume this thread also applies to products that aren't specifically designed for bike use but can be repurposed.
I carry my bikes in the open bed of a pickup truck and the handlebar accessories take a beating on the highway from wind, rain & airborne debris. Over the years, I've tried various handlebar protectors, some cheap and some not so much. None have lasted more than a few trips before the wind tears them up.
A few years back, I came across these arm protector sleeves
Buy Waterproof Arm Sleeves Covers, PVC Arm Protector, Oilproof Oversleeves Protection, Forearm Protector for Cleaning Fish, Car Washing, Painting, Dish Washing, Cooking, Butcher and Dog Grooming at Amazon. Customer reviews and photos may be available to help you make the right purchase decision!
At $11/pair, they are the least expensive protectors I've tried that actually stand the test of time. After 5 years and over 5000 miles, they show no signs of deterioration.
View attachment 147810 View attachment 147811
They are made of weatherproof nylon & PVC and the elastic openings allow them to be installed quickly and easily.