I love grobags. Oskar has been in the 1 tog over the whole of summer... we do use the a/c to cool the room down though. There were some times over last winter where I'd add one extra layer of a singlet or something.

I have looked at other brands and stuck with the grobag as I noticed on another one the neck area was a lot larger etc so he could slip down into it a lot easier where with the grobag he hasn't a chance. The no sleeves is so that they still get some circulation and don't get too hot.... when we get hot at night we tend to uncover our arms.