I've settled on Uriage lip balm.

My lips are so dry all year round that I can't live without lip balm, even in the middle of summer. The Uriage lip balm is a clear type that isn't sticky and doesn't have an overpowering scent, so I found it great for daily use without any burden. It adheres tightly without applying thickly and doesn't soften easily, making it a good product to use even in the summer.