Winter Melt ice melter contains a unique sizing mixture of large and small crystals of natural sodium chloride for greater melting speed and longevity. Small crystals melt on contact while large crystals offer longer-lasting effectiveness and instant traction. It works best at temperatures of 5 degrees Fahrenheit and above. It leaves no oily residue. Spread evenly over ice and snow-compacted surfaces. Quantity and melting action depend upon temperature and thickness of compacted ice and snow.