More Details Tommy Bahama "Tropicool Tradewinds" polo shirt. The soft fabric uses 37.5 Technology with active particles to allow for high-performance moisture evaporation. 37.5 Technology is derived from coconut shells or volcanic sand It uses natural elements of island life to keep you cool. Spread collar; three-button placket. Short sleeves. Vented sides. Pullover style. Cotton/polyester/spandex. Machine wash. Imported.