Tube covers
They are very good and will extend the life of your tubes as most damage results from exposure to sunlight.
Just put something over the tubes when your are not using the boat, preferably a light colour so as to reflect sunlight and heat away from the collar.
It is also worth slightly deflating the tubes when the boat is not in use to take pressure off the seams and also leave plenty of space in the tubes for heat expansion in hot weather
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