Calvin Klein CK One Micro Lightly Lined Bralette (QF5737). The Calvin Klein Lightly Lined Bralette QF5737 adds some comfort to your day (or night) with wire free cups that are lined with microfiber, a supportive elastic underband, straight neckline, and adjustable straps. Calvin Klein's Lightly Lined Bralette is made of nylon/polyester/elastane.