Q - Do these goggles have X-mode?
A - No, if you want X-mode goggles check out the Weld Mask 2 Auto Darkening Welding Goggles (#280982)
Q - Can this be used with a respirator?
A - No, this isn't designed to be used with a respirator. Miller's Weld mask 2 goggles will work with a respirator, though. Part #280982.