It also features a less common lock core/key design thats less likely to be picked by your average petty thief. seriously. Usually plastic is more durable; however, these are extremely thin and cheaply made. For 1 he was putting it on backwards. These ran too large for my narrow foot 5/10Feet - The heat treated PTFE combined with tapered insides makes the feet exceptionally smooth and well at gliding, however, I did notice some differences between speed on the X and Y axis. I needed dressy dark navy shoes to go with my dark navy slacks for a very special occasion. This will damage horizontal bar where it rest. The only con I see is that in trying to size up from her previous crocs (different design) is as if i never did. I bought the headset based on the reviews and now need to find another solution.