Hot Chillys Women's F9 Endurance 8K Crew Neck Tee 89% Polyester, 11% Spandex Made in the USA or Imported Machine wash cold Moisture-Wicking Fabric (Moisture Transfer Fibers) Ultraviolet Protection Factor 40+ Hybrid Design comprised of Chamois, MTF4000, and MEXT fabrics Mountain-weight warms and insulates