The sole of your footwear may be too stiff. In cases like this, with each step, there is a lot of movement in the spring mechanism. That abundance of movement makes it possible for snow to accumulate in between the spring and the binding. In some snow conditions, this sort of snow accumulation cannot be prevented. The use of silicone spray can help to minimize this problem, as well as to reduce or eliminate squeaking sounds caused by the binding. ​