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 Tank 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. Semi-fitted. Curved hem for a more feminine look. 63% Polyester/32% Cotton/5%Spandex. Machine wash. Imported. 2444486114307 34717300034 S20W1779