NWT’s From Website: Made from 79% recycled plastic bottles (RPET) and 21% spandex Designed for low-impact workouts Double lined, sweat-wicking material Elasticated support band designed to hit under bust Soft, yet sturdy construction with four-way stretch Shoulder strap designed to be worn on the right shoulder, 1/2"" strap width Fits true to you, we’d suggest going with your normal size 13” body length (for each size up/down, add/subtract ½”)