Frosted clear vinyl cover to place over felt or straw hats to protect from the elements, elastic edging. Keep one handy with you at all times, car, home, office, all for that sudden shower. Save your favorite hat from rain spots or ruined hat bands! Small- 6 1/2-6 3/4 Medium- 6 7/8-7 1/8 Large- 7 1/4-7 3/8 XLarge- 7 1/2-7 3/4