PETER THEOBALD says:
The obvious advantage of silhouette decoys is their incredible compactness and lightness, but they fall down on overall shape, being quite, well, flat!
Shootwarehouse has overcome this by designing an inflatable jacket that fits on the decoy and acts like a windsock.
Not surprisingly, they have called it the Sillosock, geddit?
Another big plus is they turn on their pegs to face even the slightest breeze.