Techni Ice Hot/Cold Packs start as flat, almost weightless sheets filled with a non-toxic super-absorbent polymer powder that absorbs water through a special perforation technology in the surface of the product.

To use for the first time, scrunch the sheets between your hands for a minute or so while they're completely submerged in warm water (use a very large bowl or a sink), until the air bubbles have escaped. Then simply leave the sheets submerged in the water overnight. It's helpful to weigh down the sheets with a bowl so they stay completely under water. The cells will swell (the hot pack will look like a thick quilt) and be ready for repeated use. Re-hydration is occasionally necessary after repeated use, but it will only take about 30-60 minutes to re-hydrate a pack.

For use as a hot pack, simply microwave the hydrated pack for 1-3 minutes or until it's as hot as you'd like. The pack must be fully hydrated before you heat it. Use pack over or under clothes, or wrapped in a towel or blanket.

Please note that the very first 2-3 times you heat the packs after they've been hydrated, there may be excess water that seeps from the packs. This can be prevented by simply microwaving the newly hydrated packs until hot, pressing them with a towel to absorb excess water, then letting them cool and repeating this process once or twice. After that there should be no excess water in the packs, and there will be no leakage at all.

For use as a cold or ice pack, Techni Ice is unparalleled. It can be used as a flexible ice pack for injuries. It can be frozen right down to minus 190C (more than twice as cold as dry ice). When frozen in domestic household freezers, Techni Ice packs can often double the freezer temperature. Techni Ice can keep food and drinks icy cold for days on end in a cooler, and is also very effective at reducing battery consumption when placed in 12 volt fridge/freezers. The packs are perfect for picnics, camping, boating, or fishing. Techni Ice is used by commercial transport companies to maintain perishable goods, and by medical, hospital, dental, veterinary, and sports facilities around the globe.