This wicking, performance fit top features ergonomic seaming, 4-way comfort stretch fabric, and a thermal reflecting liner. 4-way comfort stretch This product incorporates an antimicrobial treatment intended to protect the product from bacterial growth. The active biocidal substance is: pyrithione zinc. Ergonomic seaming Flatlocked construction Omni-Heat™ thermal reflective Omni-Wick™ Center Back Length: 26.0" Uses: Hiking, Ski / Snowsports Hiking type: Day hiking, Backpacking 85% polyester / 15% elastane Omni-Heat™ Reflective Anytime Stretch Jersey85% polyester / 15% elastane stretch jersey Omni-Wick™ Anytime