Held up well in 40 mph winds!
This was a great cover for our bikes during a trip from MN to AZ during constant high winds of 30-40+ mph, and rain storms. This was used on the back of our tow car, towed behind a 30' RV. It never moved, kept our bikes clean and we had no problem with visability through the taillight clear material. We use a 1Up rack, with one ebike and one tall, 21-speed mens road bike. Covered them both fully.
We did criss-cross 2 extra bungie staps knowing we would have high winds. We would recommend this cover to friends!