Canyonero

Thanks guys. I've got a size 40 7002W that fits decently, maybe a little room to spare in the chest and shoulders, but way too long and big in the arms. Debating if I should size down to the 38 in the W or WR version. Leaning towards sticking with the W. 

Does anyone know what's the difference in shirt designations between W and WR numbers? For example 7002W and 7002WR?