This lightweight performance button down is the perfect addition to any mans wardrobe.Our signature brrr cooling technology will keep you cool and comfortable no matter where the day takes you.brrr Triple Chill Effect Technology fabric technology with natural cooling minerals, active moisture wicking and rapid drying proved to instantly and permanently keep you cooler. Features: 91% Nylon / 9% Stretch (with brrrtechnology). Classic fit. Eyelets under arm for extra ventilation. Button-down collar. 2-button adjustable cuffs. UV protection. Machine wash cold with like colors. Do not use softener. Do not bleach. Tumble dry low. Cool iron if needed.