I'm looking at getting some convertible mittens, since the concept seems like the best choice for combining warmth and dexterity. Most of those that I've seen online are fleecy or knit like these ones—warm but not necessarily wind/water proof—and I don't know how well they would hold up in inclement weather:
To me, this combination of features would make for some great cold weather cycling (and all-purpose) hand wear: hefty, durable, wind and waterproof, suitable down to single-digit temps (F) or lower, with a grippy palm surface, close-fitting finger holes, a fastener to keep the flip-top open, a thumb wipe and reflective stripes on the back of the hand, and maybe some palm padding for comfort on the bars. Something to clip them together and attach them to a jacket would be nice, too.
Has anyone seen anything like this? Am I over-thinking or overdoing the features?