Size High Length The right size
A 4.92 in 5.9 in 30AA/ 30A/ 30B/ 32AA/ 32A/ 38AA/ 32B/ 34AA/ 36A
B 5.11 in 6.1 in 30C / 32C/ 34B/ 36B/ 38A/ 40AA
C 5.9 in 6.88 in 30D/ 32D/ 34C/ 36C/ 38B/ 40B
D 6.1 in 7.28 in 30DD/ 32D/ 34D/ 36D/ 38C/ 40B
E(DD) 6.69 in 7.67 in 32DD/E, 34DD/E, 36DD, 38DD, 40D, 42C
F(DDD) 6.88 in 7.75 in 32F, 34DDD/F, 38E/F, 40DD/E, 42D