If no soft tape is available, use a string to measure around your head where you want the bottom of the hat to sit. First measure the string on tape measure, then find measurement on chart below. If you can't find your size just let me know the measurement.
Size Chart:
Cap Size Measurement
6 5/8 21"
7 22"
7 1/8 22 3/8"
7 1/4 22 3/4"
7 3/8 23 1/8"
7 1/2 23 1/2"
7 5/8 23 7/8"
7 3/4 24 1/4"
7 7/8 24 5/8"
8 25"