Zoot Women's Ultra Xotherm 300 1/2 Zip Running Jersey Shirt polyester Body: 300 g. 86% polyester/14% spandex Megaheat 300 Inset: 170 g. 93% polyester/7% spandex Megaheat 170 Machine wash cold, Gentle cycle, No softeners, Dry Flat, Do not bleach, Do not dryclean