Disclaimer: I am not affiliated with the brand at all, the link is a direct link to the product. I will gain nothing if you buy them, and they're also available on Amazon. I always recommend looking to see see what's out there, so you can choose what's best for you :p. The ones I personally use are Brondell GoSpa. I've had them for 4-5 years, and never an issue. I recommend putting warm water in it if you can, feels better than cold a lot of times.