Print out our watch sizer to find your size if you don't have a tape measurer or ruler HERE! PLEASE MEASURE YOUR WRIST FOR AN ACCURATE SIZE. (measurements taken around the smallest part of the wrist, above wrist bone) This watchband tends to run a little smaller than the scrunchie watchbands. Size up for a looser fit. X-Small: fits wrists 5-5.4 inches around and is 4.25 inches long Small: fits wrists 5.5 inches - 6 inches around and is 4.75 inches long Medium: fits wrists 6.1 inches - 6.6 inches around and is 5.25 inches long Large: fits wrists 6.7-7.2 inches around and is 6 inches long This watch band is made out of a stretchy elastic material that is worn tightly around the wrist and is only compatible for an Apple Watch.