Don't waste money on different brands. Grobag is the best... you can really trust the recommendation on temperature and tog number with the appropriate clothing as recommended.
I feel so safe letting little girl sleep in grobag... don't worry about the arm feeling cold, it is important to keep the body warm (but not overheat) and it is doing the job properly.
2.5 tog grobag is not warm enough for winter law. I suppose tog is a common stanard but 2.5tog grobag is much thinner than other brand such as MiDes. Don't know why??
Also, the side zip for grobag is open from top which is not convenient for changing diapers ar. Other barnd like MiDes and Hallmark babies, the side zip are open from the bottom gar......