I don't think it lets the skin breathe as well as a normal moisturiser does. I've recently discovered Palmers Cocoa Butter for the body which has an SPF in it - it's great. SPF15! A similar idea to the face moisturisers with SPF in - worth a go!!
yes this is fine...as long as the sun screen has a high intense moisture balance. if not then i would suggest sticking to a normal moisturiser as this is more aimed at different types of skins.i.e dry skin. sun screen is more aimed at protecting you from the sun.