Polarmax Women's Tech Silk LS Crew 2015 (Black, X-Large) 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.