HeatKeep Men's Performance Base Layer Long Sleeve Crew Neck Shirt 37% Acrylic 34% Polyester 25% Rayon 4% Spandex Imported Machine washable HeatKeep quickly wicks away moisture, keeping you dry and comfortable Utilizing a special fiber content, HeatKeep retains body warmth Unique blend of yarns HeatKeep creates a luxury hand feel Constructed with stretch yarns, HeatKeep maximizes comfort with a perfect fit, providing durability and lasting shape Reduces clinging and discomfort from static electricity