open weave paper straw wavy brim size xs = 19 1⁄4 inch head circumference; 3 1⁄2 inch crown height size s = 20 1⁄4 inch head circumference; 3 3⁄4 inch crown height size m = 21 1⁄4 inch head circumference; 4 inch crown height size l = 22 1⁄4 inch head circumference; 4 1⁄4 inch crown height