Icebreaker Women's Siren Cami Icebreaker Women's Siren Cami is sexy and rugged, with an inner shelf bra low V-neck cut and shaped hem in sizes extra small to extra large for that ultimate fit. The fine, smooth wool is incredibly lightweight and breathable yet also serves as an insulator and protective layer beneath heavier clothes. Throw those annoying bras in the campfire and instead slip into something that offers support without the hassle. The cami's merino wool promises to be soft, comfortable and luscious against your skin without itching or sweltering.