PURE GENIUS racer back bra by MAIDENFORM. Practical & comfortable, it offers excellent support & can be worn every day or for moderate exercise. Its features make it a key lingerie piece.PURE GENIUS racer back bra by MAIDENFORM. Practical & comfortable, it offers excellent support & can be worn every day or for moderate exercise. Its features make it a key lingerie piece. With a racer back for bare shoulders & a front fastening, itâs perfect under a sleeveless top or dress. Lace sides & back (lined with microfibre where there is contact with the skin) for sophisticated elegance. Full-fitting finely moulded cups for a rounded, plunging cleavage. Soft & adjustable straps. 78% polyamide, 22% elastane. Please note due to French bra conversions, for sizes E & above, please order the size larger than usual to receive the correct size.