Slim performance fitness Head Bands to replace your cotton/poly sweatband, awesome soft 50% bamboo charcoal/poly blend, retaining therapeutic warmth & releasing excess heat, antimicrobial fibers to reduce bacterial buildup & odors, non-irritating to the skin, stretch up to 15”. Ideal for Running, Soccer, Softball, CrossFit, Fitness, walkers, runners, bikers, on a run, run to the grocery store & get your message out there, One size fits most.