Borosil best selling bottles, the Trek Series are stylish, easy to use and look as good as new, even with daily use. The wider mouth makes it easy to drink from and to clean, and they keep your drink hot for 20 hours and cool for 24 hours! The durable finish ensures that the bottles look as good as new, even with daily use. Available in a range of designs, the Trek is our bestselling design for good reason!