XS SIZE: Inner Circumference = 6.1", Width = Widest part (Top) is approximately 3/4" wide. The rest is approximately 1/2" wide. S/M SIZE: Inner Circumference = 7", Width = Widest part (Top) is approximately 3/4" wide. The rest is approximately 1/2" wide. L/XL SIZE: Inner Circumference = 7.5", Width = Widest part (Top) is approximately 3/4" wide. The rest is approximately 1/2" wide. XXL SIZE: Inner Circumference = 8.5", Width = Widest part (Top) is approximately 3/4" wide. The rest is approximately 1/2" wide. *Approximately *Please measure your wrist before ordering to determine which size you need.* Track your progress in style! This metal Activity Tracker Bracelet allows you to conceal your Fitbit Flex, while still being able to track your progress throughout the day. Easily worn every day or even to special events, this is one of our more simple and versatile bangles that easily transitions from day to night. Hide your fitness tracker easily and discreetly. Q: WHAT SIZE DO I NEED? A: Please see Size Chart. Feel free to print our Free Printable Wrist Measurement Ruler available on our website. HOW IT WORKS: We engineered a fashionable alternative to securely hide and fit the FitBit Flex tracker perfectly! This concealed pouch means that the Fitbit Flex will not dislodge from under the bracelet or pouch. So rather than wearing the plain plastic band that comes with your Fitbit Flex, you can simply use this elegant bracelet to dress up your look! QUESTION: Will the FitBit be as accurate if worn in a necklace or a headband? ANSWER: YES! The Fitbit engineering team has developed tracking algorithms to ensure accuracy whether the Flex is on your wrist, your core, or around your neck. For best performance, make sure that your "dominant hand" setting is on "non-dominant." Check out our other necklaces and bracelets designed to be worn with your FitBit! *Not recommended to wear during work-outs or sleep.