Rode VO is a kick wax that's designed for temperatures where it's challenging to get a good grip and glide at the same time. It's formulated specifically for fresh, fine-grained conditions and is suitable for new snow or snow that hasn't yet transformed, around the freezing point. The amount of wax needed will depend on the distance you have to cover and the abrasion of the snow.
To increase speed, but lose a little grip you can heat the wax with a iron.
On very abrasive snow or on tracks that have many curves or to cover long distances is necessary to apply a base (New Black Base P70) that allows the wax to anchore to the ski longer.
Rode Top Line VO 45g