KIGO's HF fixing berms have a high fluoride content, which prevents dirt particles from getting stuck in the berm. This allows the slide and mount to be maintained for a long time. The HF wool is also thermoelastic, which means that the wool varies in hardness with the temperature, this prevents sub-freezing.
HF Yellow works in all snow types, very functional when the tracks start to get slippery. Temperature range -1 to +5 degrees.