I hand crocheted this cap with lightweight cotton/ linen blend yarn…it measure 6 long & will fit (or stretch to fit) most average size heads (21 - 23" in circumference) - please contact me if you would like a custom size. 6"= 15.24 centimeters long 21" - 23"= 53.34 - 58.42 centimeters in circumference the brim has an insert which I hand cut from washable plastic & hand stitched in, this will provide sunshade while nice quality cotton/ linen blend yarn keeps you cool, breathes & grows softer with each wash…although the yarn is lightweight, the Belgian linen has a very low elasticity which will alleviate too much stretch - your cap was made with care, attention to detail & will last you a long time. this hat is suitable for both men & women. please hand wash & air dry your cap for best care. this is an original design by bigalhats." Crochet Baseball Cap, Cotton Linen Blend Slate Gray