What is the width of these?

The collar around neck is 3” the flaps that cross in front to secure it are 2 1/2”. The length is 27 1/4”. Hope that helps.

Is it filled with water or gel?

All of our Flexifreeze products are 100% water.

How long does the ice cubes last keeping you cool?

The ice melts pretty fast, but the liquid stays cold for a while. I get an hour to an hour and a half of cooling.

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