Training for marathon? Nikes running hand held water bottle is made from (40%) lycra (20%) polyester (15%) eva (10%) rubber (10%) pu (5%) nylon. Designed for use in either hand / Symmetrical shape is equally comfortable or secure in the left or right hand lets runners regularly transfer to avoid fatigue. Textured rubber thumb pad / Adds grip and comfort makes the bottle easier to squeeze. Squeezable PE material / Easy to squeeze for hydration on-the-run. Angled wide mouth opening with pop-up valve / Allows for easy filling cleaning addition of nutrient mixes easy to squeeze and close. Zippered small-items pocket / Holds on-the-go essentials including keys and money. 16oz / 500ml capacity.