Ideal 1st layer tor comfort and warmth. Smooth and Soft: Great for layering or wear it alone.100% Acclimate® Dry Polyester. Moisture Wicking. Breathes. Quick Drying. Single layer-flat seam construction for ultimate comfort. Relaxed Fit. Anti-microbial/ anti-odor protection. Machine Wash and Dry/ No Shrinking. 100% Made in the USA!!!!