PLAYTEXWomen's 18 Hour Wireless Bra 474C, Ultimate Lift T-Shirt Bra, Stretch-Cotton, Full-Coverage

I noticed this product has the California cancer causing Proposition 52 label. Why?

what is the fiber content? Cotton plus what and in what %

Is this bra seamless? I ordered a different style Playtex and it had seams inside right over the nipple area, so itchy - hate that.

Does your nipples show?