The combination of award-winning Climate Lock double-wall vacuum insulation and cutting-edge TK Closure and caps takes thermal performance to a whole new level. Weve replaced our traditional external thread closure system on our lids and bottles with a revolutionary internal thread design. This new design creates a stronger insulated barrier inside your Kanteen. Use the loop cap on our TKWide to create an all stainless enclosure for optimum thermal performance. TK Closure coupled with TKWide Caps and our Climate Lock vacuum insulation effectively traps heat or cold. Be careful when you take your first sip drinks stay piping hot or icy cold for hours and hours. TKWide Kanteens are built to take a beating and still look good at the end of the day. Our chip-resistant Klean Coat finish is not only four times more durable, but also exceeds regulatory standards for human and environmental safety. Go ahead, bang your TKWide on boulders in your favorite trout stream, toss it in your commuter bag, stash it ramp-side at the skatepark. You might get banged up, but your Kanteen wont.