I own four of these bras and I am always on the look out for other colors to buy online or in store at REI. I am a 36A/B and the M fits perfectly! It is very supportive while not being constricting at all. The strap length and length of the bra from shoulder to below the bust is the reason this bra is my all time favorite though. I struggle to find sports bras that do not constrict my arm movement and do not lift up when I lift up my arms and I often have to size up to fix this issue, but not with this bra! I have my full range of mobility in this sports bra while being supported, and this means I can wear it for everything. I wear it for running, lifting, under a triathlon suit, climbing, cross country skiing, biking, and everything else between these activities. Additionally, I have never chafed in this sports bra, even when I was drenched by sprayers while running a hot marathon!