It's wicking, warming and ergonomic qualities make it a versatile, year-round, long-sleeve shirt. Wear it as an active fit baselayer in the winter, or as a standalone during workouts and recreation throughout the spring and fall. Performance fit shirt made of 85% polyester and 15% elastane feature Omni-Heat thermal reflective, Omni-Wick, 4-way comfort stretch, antimicrobial treatment protects this product from bacterial growth, ergonomic seaming and flatlocked construction. Material: Polyester, Elastane.