I have used those boots with great success. This is what I do to keep them
cold. I fill up those two-liter soda bottles with water ahead of time and
freeze them. They serve as giant ice cubes. Then I will put one or two of
them in an ice chest, fill 1/3 full of water and throw in the boots. (mix
thoroughly!) :^) Then, as the ice melts in the plastic bottles, you have
ice water to use either for drinking, cooling or pouring out into a bucket
or the ice chest to keep the boots cool. By using them for twenty minutes
at a time, then throwing them back in the ice water they will be ready again
when you need them.
I have found that the nice cool water in the melted two-liter bottles are
wonderful for pouring over the horses neck and poll when it is hot. They
also stay cold and frozen a lot longer than regular ice, and are much more
practical than blocks of ice. (and the best part is you don't have to pay
$$ for ice!)
You can buy these boots at Bloodline Veterinary Supply 1-800-346-2675. The
best price I have found - $23.99 for one pair.
They work much better than my friends much more expensive ice boots.
I noticed one of the top ten horses at the Tevis using these boots.
Karen
in Gardnerville
P.S. These boots have stayed cold for up to a week after I get home from
the race!!