Each month features a shirtless young man holding an adorable rescue kitten, and 100 percent of the money made from the $20 calendars goes directly to caring for felines at the Massachusetts no-kill shelter.
Since the first calendar's release in 2008, more than $80,000 has been raised for the animal rescue.
The Kittendales project was conceived in 2007 when the shelter's board of directors was brainstorming how to fundraise.
Photographer Joanne Berman offered to shoot the calendar at no cost, and the shelter started looking for volunteers to become the first Kittendale models.
"The response from the guys was overwhelming," the Hull Seaside Animal Rescue website reads. "Their willingness to donate their time and desire to be a part of this venture, for the benefit of the kitties, was extraordinary!"
Check out some of the men from the Kittendales calendars past and present in the photos below.
Related on MNN:
- Why do cats groom people?
- Cat sounds and what they mean
- Lolcats: Where they came from and why we love them