Some of our Sports Bras, Balconette Wireless and Bikini Tops have their own sizing system where the letters correspond to the circumference and the numbers correspond to the cup. They are translated from our regular bra sizes. They go like this:

60F = XXS3
60H = XXS4
65C = XS1
65DD = XS2
65E = XXS3
65F = XS3
65G = XXS4
65H = XS4
65J = XS5
70B = XS1
70C = S1
70D = XS2
70DD = S2
70E = XS3
70F = S3
70G = XS4
70H = S4
70I = XS5
70J = S5
75B = S1
75C = M1
75D = S1
75DD = M2
75E = S3
75F = M3
75G = S4
75H = M4
75I = S5
75J = M5
80B = M1
80C = L1
80D = M2
80DD = L2
80E = M3
80F = L3
80G = M4
80H = L4
80I = M5
80J = L5
85B = L1
85C = XL1
85D = L1
85DD = XL2
85E = L3
85F = XL3
85G = L4
85H = XL4
85I = L5
90B = XL1
90D = XL2
90E = XL3
90F = XXL3
90G = XL4
90H = XXL4