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NOW EVEN BETTER-Our best synthetic moisture-wicking fabric is now updated with a better stretching spandex blend for cool-weather activities. Antimicrobial Polartec Power Dry is 96% polyester/4% spandex. Fast-drying midweight fabric is our top pick for vigorous aerobic activities. Machine wash and dry. Soft double-plaited interior efficiently pulls dampness away from your body. Pill-resistant exterior quickly disperses moisture so you stay dry. Flatlock seams give you a smooth fit. Thumb loops keep sleeves down. Imported.