An ultra light and cool layering piece that goes the distance, this innovative women's half zip from the Columbia Titanium collection cuts weight and keeps you comfortable with Omni-Freeze Zero mesh inserts, which use airflow to amplify the shirt's innovative cooling affects. Bonded seems deliver chafe-free comfort during repetitive motion over long miles, and sweat wicking technology pulls moisture away from your skin to keep you comfortable and dry. Active fit shirt made of 89% polyester and 11% elastane Omni-Freeze ZERO sweat-activated super cooling, Omni-Wick, 4-way comfort stretch and bonded seams. Material: Polyester, Elastane.