Ah, ok... In that case, I wouldn't recommend winter shoes/boots at all. At 50°F (heck, even down to 32°F, depending on your tolerances), I'd recommend one of a few different options, depending on the specific situation:

• Lightweight, waterproof, cleat-compatible shoe covers.
• A double-layer of socks for extra insulation (still prone to getting soaked, though).
• Insulated, waterproof socks.
• My favorite on this list: water- and wind-proof oversocks, which are worn (as the name implies) over your socks, but inside your shoes. I have a pair of these and I really like them a lot more than shoe covers.