The Toko Tribloc HF Blue and XCold Powder mix is recommended quite regularly this time of year. The XCold Powder makes your skis have better breakaway speed - they accelerate better in cold snow.
It is important that it is applied correctly. When you drip on the HF Blue, DO NOT flatten it out with the iron before applying XCold Powder: the XCold will stay on top and the end effect will be basically an application of HF Blue. Always drip on HF Blue, then sprinkle on XCold Powder, then iron in together.
Watch this video for a refresher on how to apply the HF Blue/XCold Powder mix!