The REI Women's Co-op 1/4 Zip Tech Base Layer Shirt in Blue, size S, is a pre-owned activewear top made of polyester and spandex. It features a collared neckline, long sleeves, and a zip closure. The pullover style shirt includes a 1/4 zip and is suitable for walking, tennis, golf, hiking, and running & jogging. The shirt is part of the Co-op product line and is designed for casual wear.