HeatGear® fabric is ultra-soft & smooth for extreme comfort with very little weight Strategic mesh panels for added ventilation where you need it 4-way stretch construction moves better in every direction Material wicks sweat & dries really fast Anti-odor technology prevents the growth of odor-causing microbes Ergonomic flatlock seams for added comfort & mobility 90% Polyester/10% Elastane This shirt is stain-free and in great condition!