1) I ordered the set. But what I received was just a pair. I emailed to ask them the difference and received no response.
2) they don't stay on. So I can wear it under loose clothing. Their website says the heat will get it to adhere. It's fallen off when I was outdoor and sitting around.
3) said it was waterproof and will stay on under a bathing suit. Again does not stick. It came loose on contact with water and actually swept away with a wave and I lost the pair.
4) the smell funky after prolonged wear.

I haven't had the above issues with other silicone nip covers I have used in the past. I had high hopes but was disappointed.