4.25 x 5.5" (A2) folded with blank Interior #110 100% recycled paper with with kraft brown envelope Commercially compostable plastic sleeve Blank inside How do birds stay warm in winter? With their downy feathers, of course — but a cozy scarf can’t hurt, either. My cards are for curious people who seek a little something extra from their greeting card purchases. That's why I write my discoveries and stories on the back of each card. Created for curious people who wonder about things, each card includes curious discoveries about birds and other curiosities (see photo for card text). Part of the Cats in Hats Collection. Blank for season's greetings of any winter occasion. Also good for Christmas, New Year and winter holidays. Great for bird and nature lovers!