Each month has a different tortoise cozy for you to enjoy. You can see it unveiled here:
The calendar is available in the US from Amazon, Calendars.com, Barnes & Noble, at Target, Jet, Wordery, Quarto, and several other places locally and online. The Tortoise in a Sweater calendar is also available in the UK from Amazon, Calendar Club, and WHSmith, and in Canada from Amazon, and Calender Club. It may be available in other countries as well.
Disclaimer: Tortoise cozies are meant to be used as for-fun items, only briefly to be used, under strict supervision, away from a heat source.