Cool Canuck T Shirts are soft and supple, breathe easy and manage moisture very efficiently. Coolcore technology transports moisture from areas of high concentration to low. Rather than simply wicking moisture and evaporating it away, this patent pending fabric technology is engineered to wick, trap and cool moisture creating temperatures as low as 15C with just perspiration. If immediate heat relief is needed, our shirts can be pre-wet, wrung out and then worn. The fabric is designed to hold a reasonable amount of water without feeling heavy or uncomfortable. UPF 35 reduces the effect of the sun's rays. Machine wash, no fabric softener. Every Cool Canuck product is guaranteed to be free of manufaturers defects for a period of 30 days. Made in Canada.