Most Thermal Vibes Heat Caps are available in the following sizes:
Kids Sizestarting circumference, approximately 17″.Max circumference (fully stretched) approximately 34″Diameter 18″
Regular Adult Sizestarting circumference, approximately 21″.Max circumference (fully stretched) approximately 36″Diameter 22″
Adult Large Sizestarting circumference, approximately 22″.Max circumference (fully stretched) approximately 44″Diameter 23″
Adult XL LOCS Sizestarting circumference, approximately 25”.Max circumference (fully stretched) approximately 50″Diameter 26″