I have multiple versions of the standard BabyLegs and LOVE them.  I was debating what to do with my wee one as the weather turned warm and I didn't like the idea of sunscreen because...
1) it was inevitable it would end up in her mouth through one avenue or another
2) she needs knee protection anyway
3) I find pants too constrictive (she's on the bigger side with a nice round bum)
...and was thinking "I wish they had summer weight BabyLegs" and lo and behold, they do!  Granted, I live in Seattle where it has to stretch to get over 90 even on the hottest days, so I can't speak for those of you in warmer climes, but they do not get my baby too hot at all.

The only reasons I gave them 4 instead of 5 stars is that:
1) they are stretchier than the originals and so don't stay put quite as well, but that can't really be helped
2) they only come in patterned white - hello dirt/grass stains!