"Relentless" Water Bottle is a high quality double walled stainless steel water bottle built to last. Its vacuum insulation technology keeps drinks hot for 12 hours or cold for 24 hours, ensuring optimal temperature for many hours. It's corrosion and rust resistant for long-lasting use and its lightweight and leak-resistant design make it perfect for on-the-go use. 23oz w/ detachable straw for easy cleaning.