Reusable with added value. The longer a product can be used, the better it is for the environment. GEFU consciously focuses on durable reusable products that help avoid plastic waste and conserve valuable raw material and energy resources. Thanks to their long lifespan, there's no need for constant repurchasing of environmentally harmful single-use products - good for nature, good for your wallet. This cool on-the-go companion made of robust stainless steel is perfect for school, work, and travel. Its double-walled insulation keeps tea or coffee hot for up to 4 hours and water or juices refreshingly cold for up to 8 hours. Featuring a practical push-button closure and is 100% leak-proof.