Sizing: Extra Small - (Fits 4/2V and 4/3V) XC-11 - (Fits SC 11/7 and Doble 11) Small - (fits XC 20 Signature, SC 20/20 Signature, Doble 20, and SC 20/12V) Medium - (fits XC 34/18, SC 33/26, XC 33/22, Doble 34 and SC 36/32) Large - (fits XC 43/28,...