Hot Chillys Women's MEC Solid Zip T-Neck Base Layer Top 89% polyester/11% spandex Made in the USA or Imported Machine wash cold Midweight, Moisture-Wicking Fabric (Moisture Transfer Fibers) Ultraviolet Protection Factor 30+ Bio-Silver Anti-Microbial Odor Blocking Properties The Chamois fabric has a lightly brushed interior for a soft, fleecy next-to-skin feel