KR-1 replacement, removable, washable inner liners:
Size XS-XXS (YAKR0107): To make an extra small a firmer fit (turns an XS, into an XXS)
Size XS (YAKR0101): Can be used to make a small a firmer fit
Size S (YAKR0102): Can be used to make a medium a firmer fit
Size S-M (YAKR0109): To make a small a looser fit (turns a S into an M)
Size M (YAKR0103)
Size M-L for M shell (YAKR0110): To make a medium looser (the shell size changes between MD & LG, this fits the MD shell)
Size M-L for L shell (YAKR0111): To make a large a firmer fit (turns a LG into a MD in the LG shell)
Size L (YAKR0104): Can be used to make the extra large looser, or replace a worn large liner
Size XL (YAKR0105): Can be used to make the large a firmer fit
Size XXL (YAKR0106): To make the extra large a looser fit (turns XL into XXL)