The Vital series has been updated to a blend of Polyester, Cotton and Spandex for better stretch and movement It's also quick-drying and antimicrobial to keep you feeling fresh. The Vital Crew Neck Tee is ideal for any backpacking or overnight hiking trips. TechDry: Our quick-dry fabric that prevents body heat loss and discomfort by absorbing moisture from the body. Anti-Microbial. Fitted. 62% Polyester35% Cotton3%Spandex. Machine wash. Imported.