Performa's 28 ounce PerfectShakers from the Spartan Race Series are durable, secure and leakproof protein bottles. With the twist-lock cap and firm, snap-on covers, you'll never have to worry about your pre-workout or protein leaking. Performa's bottles are so lightweight and portable, they're perfect for any athlete's busy and on-the-go lifestyle. These protein shakers are the top-ranked amongst their competitors for strength and durability. With Performa's fully licensed protein shaker bottles, you are free to express yourself and give people a taste of who you are!