Each derby is individually shaped by hand and shipped to you in a Hartmeyer hat tote. "Hat reducing" tape is included with each hat to insure a snug fit. Since there is little give in a derby hat, you may need to go up a size. To measure, encircle the largest part of your head just over your eyebrows. If you find yourself in between sizes, it is better to lean towards the bigger size. Please see the chart below to ensure correct sizing for you order.