The length around the Youth sized silicone wristband is 7", or 180mm. This length measures the circumference of the wristband, which is the length around the perimeter of a circle:

Our Youth Size wristband is best if your group is expected to be on the petite side. It's perfect for youth events (ages 6-12) featuring both genders. Women-only events also sometimes consider this option to ensure a snugger fit.