Single layer mesh & lace (very sheer, very breathable). Overall very stretchy (good for weight or monthly fluctuations). Narrow wires and deep cups (make for good projection). Cups have a top stretch binding (somewhat closed up top, good for short roots). Lace across cups will show under a tight T-shirt, but tends to camouflage nipples. Wires are flexible (move with you, don't pinch). Straps are set closer to center (so they won't slip off).

Knocked off one star for durability: it will likely stretch out quickly and/or snag on jewelry.