WaterDam provides professional swimming ear plugs for all people at any age. Classic Series: Size 0: Infant Baby 3-12months; Size 1: Toddlers 1.5-4.5yr & ExtraSmall Ear women; Size 2: Kids 6-14yr and Medium Ear Women; Size 3: Medium Ear Men and Large Ear Women&Teens; Size 4: Large Ear Men. A-Series: Size 1A=0.8; 2A=1.8; 3A=2.8 WaterDam Swimming Ear Plugs feature great waterproof and superior comfort to wear. Perfect choice to prevent swimmers\' ear and protect ears with tubes. Question:Can these be worn if eartubes are placed in? Answer: For users with ear tube, the most important thing is that the waterproof effect must be good. The second is the earplugs won\'t break or even have parts fall and left in ear canal. The last but not the least, the length should not be too long otherwise it will hurt inner ear and be too close to the ear tube. Waterdam earplugs have the best waterproof performance among all kinds of earplugs, with the shortest length and the most expensive high-quality flexible silicone material. It is impossible to break naturally, so it can be worn under normal conditions. If there are other pathological features of the ear canal that require more special care, it is recommended to consult a doctor before wearing it.