Equipped with IsoBound technology, the Skyflask IT is a nifty choice for both hot and cold weather: its insulation keeps your drink fresh or thawed for longer. Slip your hand between the bottle and its back-of-the-hand strap, and you're ready to go! The bottle can even be frozen - just remember that water expands as it freezes, do not fill the bottle all the way up if dou freeze it. - Leak-free top with a locking position for transport - Adjustable strap - The bottle flattens as you drink - this means it won't develop an air bubble, thus preventing your drink from sloshing - Free of BPA and PVC - The Isobound insulation maintains your drink's temperature 38% longer than regular bottles - Commonly used 42 mm threaded mouth - Material: TPU, with welded seams - Max. temperature of water: 60 ºC