The traditional wide-mouth water bottle just received an upgrade, in the form of durable, vacuum insulated double wall capacitor stainless steel. We're not knocking our hydrator TR it an version-we love it too. But when blazing summer heat or sub-zero winter weather demand extreme performance from your hydration container, the fuse ss is nice to have on your team. The powder coated fuse ss features the same durable, flexible tpu-tethered wide-mouth top as its larger counterpart, and is BPA free and totally dishwasher-safe as well.