Thanks ladies, my problem is I already have him sleeping in a long sleeve all in one suit plus the sleeping bag, and the last wk or so have added a singlet. so when it gets really cold???? granted i've just had him in the cotton type suits not the bonds toweling type ones, which I suppose would be warmer??? He won't keep any blankets on either!!! Any thoughts on the polar fleece type bags,?? Thanks again ladies!!!