8"To ensure a perfect fit for your silicone wristband, it’s important to measure your wrist correctly. Follow these simple steps to find the right size: 1. Use a flexible measuring tape, or wrap a string or a strip of paper around your wrist, making sure it’s not too tight or too loose. 2. Mark the point on the string or paper where it meets the end, creating a complete circle. 3. Measure the length of the string or paper with a ruler. 4. Compare your measurement to our available sizes: 7.5 inches, 8 inches & 8.5 inches. 5. Choose the size that most closely matches your measurement. Please keep in mind that these sizes are general guidelines, & some people may find that they prefer a slightly tighter or looser fit. If you want a more tight fit to choose one size smaller & if they want a more loose fit to choose one size bigger. Please note that, if the wrist measurement falls between two sizes, it is recommended to choose the bigger size for comfort. Black & White Vaccinated Silicone Wristband