Columbia Men's Blood & Guts III Long Sleeve Woven Shirt Omni-Shield Release Twill 100% polyester Imported Omni-Shield Blood 'n Guts advanced repellency Omni-Shade UPF 50 sun protection Sun protection collar Vented. Roll-up sleeves with tab holders. Rod holder Omni-Shield blood 'n guts Advanced Repellency Omni-Shade UPF 50 sun protection Roll-up sleeves with tab holders Vented in back