The lightest and highest performing squeezable Thermal 4 Hour bottle, whichever way the mercury is heading, the Nano Fly has you coveredNanogel is the worlds lightest and best performing solid insulating material,Nanopores within the structure of the material trap gas molecules and offer a drastic reduction in heat transmission,This 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 performance,In recognition of the Nano Fly\'s utility in the wetter and grittier parts of the year it now comes with a removable MTB valve cover,High 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 sportives,Soft squeezable casing gives high volume refreshment whilst on the bike,Large opening aids cleaning and refilling,Keeps drinks hot or cold for up to 4 hours, the longest of any squeezable cycling bottle,Dishwasher safe and BPA-free.