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your welcome there really just a black colored bag . the dark color absorbs the heat , heating the water.. they do work .. depending on temperature.. and colder days you fill it with hot water ...
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[–] ssgrader 0 points 1 point 1 point (+1|-0) ago
your welcome there really just a black colored bag . the dark color absorbs the heat , heating the water.. they do work .. depending on temperature.. and colder days you fill it with hot water ...