Silipint products are unbreakable, reusable and completely safe. They're BPA-free, FDA-approved, and non-toxic. Throw them in the dishwasher, the microwave or the freezer...seriously, go ahead and throw them. They're better insulators than glass, plastic, paper or Styrofoam, meaning they'll keep your coffee hotter and your beer colder, all the while keeping your hands comfortably, well, comfortable.