<Size> Head circumference 60cm - 63cm Unused with tags. My head was too big for it. If anyone is interested in purchasing, please consider. Running x 4D HEAT. RDY 5-Panel Cap You need a cap to reduce sun glare and keep your hair out of your eyes while running. But choosing the wrong cap can make your head feel hot. This Adidas 5-panel cap works well in that respect. The HEAT. RDY technology fabric promotes ventilation while absorbing sweat, keeping you cool and dry while running. The material used is Parley Ocean Plastic, which is upcycled plastic waste collected from islands, coasts, and coastal communities before it enters the ocean to prevent marine pollution. This is used for more than 50% of the yarn used to manufacture the cap, and more than 70% of the entire product is made of recycled materials. Free size 100% polyester (ripstop) Laser-cut ventilation HEAT. RDY The brim can be flipped up Running 4D HR Cap