Yup they are BRAs with three different colors.
But if guessed they are women's bra.. AHAA... dame desu!!! you guys are totally wrong!!!
They are Men's Bra and been sold for two weeks at RAKUTEN and they are really popular even they have achieved 1st place for men's inner wear sales ranking for two weeks (from japanprobe).
I just cant imagine that one of my friend wears this, probably I will not stop laughing at him XD
Well it is nice that Japan has weird products but this one.. it's beyond my comprehension.