NWT Columbia Thistledown Crew 👕! The thistledown park crew is a technically superior tee for layering or wearing alone. It features omni-wick polyester fabric which offers great moisture management and breathability 67% Polyester, 33% Cotton * Imported * No Closure closure * Machine Wash * Omni-wick pulls moisture away from the body so sweat can evaporate quickly * UPF 15 sun protection