Person, Place or Thing?

Can you guess what I am?

■ I don’t usually show up at night ■ I come with a frame ■ People sometimes take me skiing ■ I can be dark or light ■ To some, I’m more of a fashion statement than anything else ■ I might hug your head ■ People seem to lose me a lot ■ I’m most popular in summer ■ My screws are very tiny ■ Ideally, I protect your eyes from harmful rays