Neck Coolers, Cool Ties, Cool Wraps, Cool Pads
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You'll find information on the raw materials for these products at WaterCrystals.Com
These small, pure polymer water crystals absorb and hold water to make cool ties, wraps, and pads, neck coolers, and crafts. They expand to hold up to 500 times their dry size, swelling from the size of a freckle to almost that of an acorn.
As their moisture content is depleted from warmth and transpiration, the water crystals return to near their original size and smaller. When wetted again, they re-swell with water--cool or hot. This expansion and contraction takes place for years.
And, unlike other types of hydrogels, Water Crystals are a pure polyacrylamide co-polymer that absorbs and releases salts. These water crystals are odorless and non toxic, and they are less susceptible to mold and unpleasant bacteria than other types of polymer crystals on the market.
To get the complete details, go to: Water Crystals. You'll discover an easy to navigate, information-packed web site.