Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Peace of mind.

As a winter commuter, I recently had a flat in the bitter cold. Not a happy experience. Very, very miserable. So I got Slime and a Mr. Tuffy tire liner. I followed the directions exactly, and the slime went in nicely. Adds a fair amount of rotational weight, and I'll definitely shift to non-Slimed tubes in the summer, but I assume the Slime/tire liner combo are protecting me. No flat for the month and a half since I've put them on.As an interesting aside, the Slime settles to the bottom of the tubes, and when you just start out biking, you can feel (faintly) the rhythmic thump-thump-thumping of the out-of-balance tires. But after a minute the Slime redistributes and the tires roll smooth.