The Flight Tech Tee is designed with firsthand experience to ensure the perfect synergy of breathability, performance, and protection for those daring to thrive in extreme heat. Product Features: FABRIC: 88% Polyester, 12% Spandex PRODUCT WEIGHT: 6.6oz Sizing Information: WOMENS XS S M L XL US SIZE (numeric) 0 - 2 4 - 6 8 10 - 12 14 - 16 BUST 33 - 34 35 - 36 37 - 38 39.5 - 41 42.5 NATURAL WAIST 25 - 26 27 - 28 29 - 30 31.5 - 33 34.5 HIPS 35 - 36 37 - 38 39 - 40 41.5 - 43 44.5 All BOTE products are built with an athletic true-to-size fit. If your measurements fall in between sizes and you prefer a looser fit, we suggest choosing the next largest size.