Polarmax Men's Comp 4 Tech Fleece Long Sleeve Crew polyester 90% ACCLIMATE DRY POLYESTER 10% LYCRA 4-Way Stretch Fabric/Wicks/Breathes/Quick Drying; Anti-microbial/anti-odor protection; 100% Made in the USA Athletic Fit-No Bulk Comfortable Flat Seams (Next to Skin)