Is there a way to tighten the arms on oakley SI fuel cells?
There is no way to re-tighten them. There is no screw. they are a snap in design so the arms pop in and out. They're also a nylon based material so you can just heat and bend the frame. I'm not sure what you mean by Stay in place. Once they open, they'll be on your face. Are you concerned about the arms opening when you have them off your head. If you look like your profile picture/avatar, i can say with about 85% certainty that the glasses are two big for your face. Sorry to be the bearer of bad news, but you may be out of luck. HTH D
Some fake Oakleys have the Oakley logo displayed on the nose with a ? to the right of it. This is to accomodate some countrys' customs regulations of transporting items with logos.
Oakley sunglasses come with pouch in bag, box or hard shell case with documentation.