Made of 100% food grade high quality silicone and is BPA free, Large Diameter,Adopt extra large caliber, it is easy for our folding bottle to pour water into and out. Can be frozen or poured into hot water (recommend,10 to 60 degree hot water).Lightweight,Foldable water bottle of us is soft and foldable, which can saving space effectively and be placed in any backpack pocket without leaving creases.Easy to Clean, Welcome to custom your Logo. Contact us for details.