Custom personalized water bottles are made with 100% food-grade stainless steel, which not only makes them safe for drinking water but also makes them a long-lasting product. It is also rust-free, further increasing its durability. The lids of the bottles are drip and leak-free, which will keep the outside nice and dry. To ensure your peace of mind, Borosil also offers a 1-year warranty on manufacturing defects of custom water bottles.