From Goodlife Bottles affiliate newsletter:
Our bottles unique patented duel wall design, combined with its proprietary vacuum seal cap is the secret behind Good Life’s amazing ability to keep liquid hot or cold for up to 24 hours! The liquids always stay fresh & clean and won't leave a funny after taste in the bottle. We've tested our bottles under extreme conditions and the GoodLife bottle always surpasses our expectations! The unique shape and craftsmanship of the bottle provides you with quality, durability & style. Whether you are hiking, biking or walking the streets the GoodLife bottle is a safe, functional and always healthy companion for you, your family and the environment. 100% BPA-free, non-leaching & toxin-free Unique Dual walls with vacuum-seal cap keeps liquid hot or cold for up to 24 hours! High-quality food grade 18/304 stainless steel Eco-friendly alternative to plastic bottles Stylish custom design & craftsmanship Durable, lightweight, reusable and 100% recyclable