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) X-Small: fits wrists 5-5.4 inches around and is 4.5 inches long Small: fits wrists 5.5 inches - 6 inches around and is 5 inches long Medium: fits wrists 6.1 inches - 6.6 inches around and is 5.5 inches long Large: fits wrists 6.7-7.2 inches around and is 6 inches long Extra Large: fits wrists 7.3-7.8 inches around and is 6.5 inches long (this band is extra stretchy so it could probably stretch up to a 8.3 inch wrist) This watch band is made out of our best selling Black Hexagon Athletic scrunchie material and is only compatible for an Apple Watch.