The Café Cap converts your Insulated bottle into a splashproof to-go mug with one quick twist. It's made from BPA-free polypropylene and is safe for use with acidic or hot beverages. But our favorite thing about the Café Cap is that it pops apart, which makes it easy to clean. No more crusty coffee funk or drink flavors you just can't scrub clean! Please note that cap is not leakproof.