It is a 100% Copper bottle for Water. Purely leak proof. This bottle is 100% rust proof with food grade guarantee. Easy to clean, Durable, Air tight, Easy to Carry, Cools Faster, best used in Office, House hold & Gifting purpose. Reduce use of one-time plastic by carrying your own fresh water in this cool bottle. The bottle is normal wash and can be stored in the freeze as well Ayurveda recommends storing water overnight in a copper jug and drinking it first thing in the morning for maintaining good health. The water stored this way is called 'Tamra Jal' and it helps to balance all three doshas (Kapha, Vata and Pitta.) The metal copper has electromagnetic energy which is called Prana Shakti.