I bought them to climb the mountains for snowboarding. When we got to the point where the tires started to slip, we stopped to pull them open. They were very easy to put on. We drove about 1/4 mile and noticed the car starting to slip again as if the clutch was missing. We stopped again and found that all the sleepers were broken. We got stuck because we didn't want to risk driving. A very unreliable product. Wouldn't recommend at all.