I have been looking for some light weight warm boots i can use for snow shoeing while out hunting. As i was looking i saw Neos overboots. I am wondering if these would work over a tennis shoe (like nike frees) and still be warm enough for -5-20 degrees? The insulated boot i have now feels like concrete on my foot and bulky. I saw the average weight of the neos overboots were around 1 lb to 1.5lb.