Jaco Tenacity II Crew Neck Thermal - Blue 35% polyester This garment is made with 45% Rayon From Bamboo, 35% Polyester and 20% Cotton Bamboo Plants grow quickly, do not require fertilizers or pesticides, release more oxygen into the atmosphere than trees and are self replenishing, making them 100% sustainable and earth friendly This thermal is embellished with 100% water-based inks which are environmentally friendly and are designed to soak into the thermal to become part of the cloth itself; making them breathable, durable, and comfortable This thermal is cut to a Slim-Fit. The fit is tighter than a regular t-shirt as the body and arms are cut narrower. Consider sizing up if you prefer a looser fit Care: Machine wash cold, tumble dry low, do not bleach