Hot Chillys Men's ME XT Panel Zip-Tee 90% Nylon/ 10% Spandex Made in the USA and Imported Unique blend of MTF nylon and spandex yarns to keep you comfortable in extreme conditions. Seams are moved off shoulder for added comfort Zip-through collar construction for ultimate warmth Soft stretch elastic seam tape at neckline Contrast stitching or panels for added style