I have the NRS Rapid glove, 1.5mm neoprene, warm but not too bulky. good price, $25. That vs mystery? Mystery is thinner, but I think that fabric is a lot stiffer. It supposedly inhibits evaporation (keep the warm in), but I have always pictured that as a clammy, wet feeling. No real experience, just my thoughts. I used to use glacier gloves for windsurfing, but now am going the Rapid glove, I like the fit better and they seem more durable/grip better.
Living in Montana, boating in Idaho