65% polyesterDo Not Bleach?? Material: 65% Polyester, 30% Cotton, 5% Spandex?? Features: Soft Stretchy material, V Neck, Long Sleeve, Backless, Asymmetrical Hem.?? Detailed Size Info: Please Refer to the Left Image Picture or Product Description Instead of Amazon Size Chart. Thanks?? Occasion: This backless shirt is perfect for everyday wear fashion,you can wear it for casual, travel, workout, club, join the party, and other outdoor and indoor active?? Garment Care: Washing max 40??, Iron with press cloth, Do not tumble dry, Do not bleach.