Response Boosters Give Mailing Impact

This mailing from the World Wildlife Fund caught my eye because it’s simple, and efficient in its use of some key direct-mail response boosters.

The face of the 4-inch-by-9.5-inch outer envelope shows a four-color photograph of a tiger with the teaser, “Who’s Watching Her Back?,” and on the back is response-booster No. 1: a time-sensitive premium offer that reads, “Respond within 10 days to get your choice of three WWF Gund plush animals! See inside for details …”