you can use a blanket as hana says, but I'm currently pushing dd3 around and for the first time ever I have a foormuff/ cosytoes and it is brilliant! So warm , so easy, no bits slipping off and catching in the wheels. I love it - but I think it's a good plan to get a generic one not a brand specific one - chances are you'll be buying other prams/buggies in the future and one footmuff has a very good chance of lasting you for the duration whatever the size of your family!