Description The inside circumference about 23.1/4”inches, with adjustable chin strap (color of string will be different) with and elastic sweat bandana incase a bit big will help and adds a comfort fit, all is handmade natural grown straw in Mexico, proudly its an artisan of MexicoThe ventilated lines of holes will be different all the time, sometimes THERE WILL BE ONLY ONE LINE OF VENTILATED HOLES OR TWO LINES, the size and place of holes will vary as well, THE VENTILSTED HOLES WILL NOT BE EXACTLY AS IN PICTURE THE WILL BE VARIATIONS.but the shape size of the HAT AND THE DESIGN will be the same as in pictureIF A STRAW HAT THE COLORS ARE PERFECTLEY EVENLY STAIN AND NO DARK SPOT IS “NOT” ALL NATURAL!the edge of the hat its made of straw as well, self edge, (no plastic edge) reason of price a bit higher more work, overall it’s a perfect size hat for basically any activity under the sun, it’s lite in weight, stylish and plenty of sun coverage. Can’t go wrong!