That is quite a coat and ruff on Louis for his age. Not all MCs seem to ever get such impressive ruffs, though, and I will say again how climate can make a big difference in the coat/ruff. We are in a hot summer climate, and despite being in A/C, the cats have much thinner coats and little ruff during the summer (now). The MC mix we had that spent time outside during the winter would develop a huge ruff and coat. Very impressive. The first winter we started feeding him while he was a stray outside, we had a heating pad for him, but he spent the night on it only when the overnight temp dropped below 15 degrees f (that is -9 c). Otherwise, his coat was sufficient to keep him warm! So keep your houses cool during the winter if you want to see a great coat.