We're planning our first tour this summer, to Brittany because we can cycle to Poole from home and straight onto the ferry. We need sleeping bags, but am a bit unsure about what weight we'll need. We're going early June, and will have a small tent. I really don't want to get cold. We're thinking about the Cumulus Ultralight 350 - will this be warm enough? Cumulus give these a comfort rating of -3C. Should we use liners? What do you wear when sleeping? - I'd rather be naked but is the inner of these bags a bit nylon-ey and sweaty? Advice please.