The Tight Crew Long Sleeve Shirt from 5.11 TacticalA(R) is built from a poly/spandex blend to provide a compressed fit for maximum performance in any environment. FEATURES AND BENEFITS Anti-microbial technology inhibits the growth of odor-causing bacteria Designed for under body armor or casual workout wear Flatlock seams and close fit reduce friction to prevent chafing SPECIFICATIONS 82% polyester / 18% spandex Quick-drying Moisture-wicking Underarm gusset panels allow moisture to vent quickly Athletic fit Imported