We have this Buggysnuggle and love it! The first thing I noticed was how easy it was to attach to the buggy. The design means it doesn't have to be tied to the buggy, it just slips over the top of the seat, but comes with ties which can be looped over the handles if necessary. It's incredibly easy to fit and uses velcro so there's no need to thread your straps through small holes (an issue I have with other footmuffs).
However it's not just designed for the colder months. The top can be zipped off for use in warmer weather and used as a buggy liner. You can tell it's been designed by mums as the zips open at the bottom allowing muddy feet to stick out!
It's available in 40+ designs so let your child stand out in the crowd!