The Affinity Infuser lid is a beautifully-designed accessory to your 30 oz stainless steel insulated tumbler that allows you to take delicious, nutrient-rich, fruit-infused water to go. Just add fruit, tea or herbs and KAZAMM!! You instantly have a flavorful drink that will make your friends jealous! Your options are endless when it comes to creating healthy, fresh fruit infused water that will stay cold for up to 24 hours in your insulated tumbler. Give up your plain water habit and embrace the exciting life of infused water with your Affinity Infuser! (Fits most 30 oz stainless tumblers)