Stretch is Comfort Girl's Neon NYLON Racerback Sports Bras 80% Nylon 20% Spandex Machine Wash Cold ; Tumble Dry Low Use These Measurements Only. SIZES BY AGE (Child): Small (6), Medium (8), Large (10), X Large (12) Racerback Bra / Moisture Wick Material / 1 Inch Elastic Waistband / Double Layered Front Chest Sizes: Small 26"-28", Medium 28"-29", Large 30"-32", X Large 32"-34"