We never used this and now he is too big. It is a really warm fleece cover for your baby carrier with a detachable hood. Works with most buckle or mei tai carriers.
Here is the link on Amazon if you want to take a look - http://www.amazon.com/Infantino-Hoodie-Universal-Season-Carrier/dp/B005C9ODUW#productDetails
$13.00 shipped in the US