Okay, let me start by saying I've been through SO many wireless bras, and this Bali one? Absolute game-changer. I'm a 36D and got a medium – fits like it was made for me. The thicker straps don't dig in AT ALL, which is huge because my shoulders always suffer with thinner straps.
The back strap actually stays put (miracle!) and the fabric feels so lightweight yet supportive. Wore it for a 12-hour workday recently and forgot I even had a bra on – that's how comfy it is.
Only thing to watch: sizing seems inconsistent between colors. My black one fits perfect but the nude ran slightly smaller. Still kept both because even the tighter one stretched to fit after a couple wears.
Bonus points: survives my lazy laundry routine (toss in washer/dryer with everything else) and still looks new after months. Already ordered two more because I never want to be without this bra!