Elite's premium nanogel thermal bottles now come with an innovative silicon inner coating, this layer can handle boiling water without degrading the bottle, no more waiting for your morning brew to cool; just pour it in and gonanogel is the worlds lightest and best performing solid insulating materialthis also makes the nanogel material light and highly flexible, and when combined with elite's unparalleled experience in bottle design and construction, the end result is a lightweight, squeezable bottle with unsurpassed thermal performancein recognition of the nano fly's utility in the wetter and grittier parts of the year it now comes with a removable MTB valve coverhigh flow rate fly valve with integrated blow off function to reduce the chances of a dropped bottle taking down a rider, ideal for group rides and sportiveslarge opening aids in cleaning and refillingdishwasher safe and bpa-free