Men's Reebok CrossFit O2CH4R63 Compression Top Z92152 74% nylon / 26% spandex Style Number: Z92152 Chlorine-resistant, antimicrobial fabric to help preserve fabric integrity and minimize odor Compression Fit - contours to your body for maximum muscle support PlayDry technology wicks sweat to help keep skin dry and comfortable BareMOVE+BREEZE mesh panels for enhanced ventilation Flatlock stitching for reduced rub and irritation