Tie up a couple of these - it's one of the best tailing crab patterns out there. The body is dubbed or wound fuzzy wool palmered with a soft webby hackle. Tail and wing are marabou or any mobile material (arctic fox etc.). Vary the colors to suit local crab pattern colors - e.g. tan with purple/blue wing.
I tied one of these for Juro's Acklins trip with tan wing and orange marabou tail.
His reports were very favorable
There is no weight and you need to soak the fly well before casting otherwise it will float but the great thing is it lands on the water like thistledown!
With a bulky wing it should ride hook-point up. It seems to work best when allowed to "drift" down-current (or down-wind) into tailing fish.