THESE UV COLOR CHANGING WRISTBANDS WILL BE THE TALK OF THE SUMMER. PERFECT FOR CAMPS, POOLS, THE BEACH, SKIN CANCER AWARENESS OR SIMPLY BEING OUTSIDE UNDER THE HOT SUN. THESE WRISTBANDS ARE SENSITIVE TO ULTRA VIOLET RAYS BOTH UVA AND UVB RAYS AND WILL CHANGE COLOR WHEN IT'S TIME FOR YOU TO REAPPLY SUNSCREEN (THE UV LEVELS WILL TURN THE ORIGINALLY FROST LOOKING WRISTBAND INTO A NICE SHADE OF PURPLE). 7.95" L X .48" H X .05" THICK