Sustainability  If you are looking for top performance in terms of durability, a lightweight build, and drinks that maintain hot or cold temperatures, NIRLON double wall water bottles check off. Nirlon Hydra Flask helps you enjoy dependable hydration with the advanced technology of our thoughtfully designed double-wall vacuum-insulated stainless steel water bottle. 2. Insulation  When you keep a double-walled water bottle close by, you can always expect your drinks to stay icy cold or steaming hot for hours. And when you need a sip of comforting and energizing coffee or tea, you can enjoy a piping hot beverage that tastes just as it should, with no metallic or plastic flavor transfer. When you're thirsty and need fast hydration, you'll also appreciate a few gulps of an ice-cold drink, even hours after you fill up your bottle. 3. Convenience  The benefit of temperature control in the double-walled water bottle is what makes it so versatile. With a leak-proof lid, you can easily toss the double-wall reusable stainless steel water bottle in your bag with your other essentials and go about your day. Its tight-fitting, leak-proof lid means that you don't have to worry about any drips or spills leaking. 4. Easy to Hold  With your Flip Lid Hydra Flask, you can reach for your drink and always depend on a secure grip and easy handling. Cold beverages stay cold in the bottle, while the outside is easy to hold and condensation-free. Hot beverages stay hot on the inside without heating up the exterior of the container, so you don't have to worry about burning your hand. 5. Simplicity  While we push for hydration and health first and foremost, it doesn't hurt to have a beautiful water bottle to stare at longingly from time to time. Available in various sizes, the double-walled stainless steel water bottle has a lightweight build that's easy to carry on the go while also providing plenty of hydration to get you through the day.