The KoolCollar also comes with a gel filled insert that you freeze and use instead of ice (minus the secondary evaporative cooling) for indoor use, to provide cooling without the dripping water.

FORBES: Dog Days of Summer? Not With the KoolCollar!

Critics claim silicone often leaks from the gel-filled devices, causing cancer and neurological diseases.

CNN: New breast implant set for trials

One of the things commonly used is a water-filled antiseptic gel wrapped around the burn which not only cools down the injury fast but helps prevent the infections which are the biggest killer of burns patients.

BBC: Saving your skin

Instead of slabs of gel, it uses capillaries filled with a liquid polymer, so that continuous flow is possible without the need to change slabs.

ECONOMIST: Genetic warfare

First, to what extent does existing research provide a reliable and reasonable scientific basis for the notion that breast implants filled with silicone gel cause or exacerbate chronic illnesses such as autoimmune diseases?

ECONOMIST: Scientific justice

The balloon has been filled with a special gel at the rate of six teaspoons full each week - with the healthy skin and hair stretching around it.

BBC: NEWS | UK | Wales | South East Wales | Burns girl grows new head of hair