Callaway Big & Tall Short Sleeve Opti-Vent Block Polo Shirt 86% Polyester, 14% Spandex Imported Big and tall Opti-Genic, keeps the garment fresh over time, reduces odor and helps maintain durability, Opti-Dri, Transfers moisture away from the body to help in evaporation Opti-Vent, fabrics allow for the garment to have maximum breathability, Transfers moisture away from the body to help in evaporation Opti-Shield, creates a layer of Protection from the sun's harmful rays Opti-soft, fabrics are designed for ultimate comfort and performance