✔ FITS PERFECTLY - Available in two sizes that allow for a flexible compatible. Size 1 fits the Hydroflask 12-24 oz water bottles, Stanley 40 oz Adventure Quencher Tumbler and Stanley 30 oz 20 oz IceFlow Flip Straw Tumbler. Size 2 fits the Hydroflask 32 and 40 oz sport water bottles..✔ MAXIMUM PROTECTION - This durable bottom boot helps protect against dents, dings and damage. Give your water bottle a longer life..✔ A MUST HAVE FOR YOUR BOTTLES - It's the perfect stainless steel water bottle accessory for your active, on-the-go lifestyle. Perfect for all sport and outdoor activities..✔ TOP QUALITY YOU CAN TRUST - This bottom boot is made of high quality BPA-FREE silicone, Safe for all ages..Join thousands of sport bottle lovers who depend on the Flaskars Water Bottle Boot. Try them out for yourself completely risk free.