The only real difference from the Half Jackets that the Half Jacket XLJs boast is their wider construction and squared frames.
The Half Jacket XLJ's O Metal frame construction allows for light and durable frames while Unobtainium earstocks and grip anchors reduce slippage, allowing for greater movement, epecially in terms of sports. Their Plutonite lens material passes ANSI Industrial Standard Z87.1 for optical clarity, high mass and high velocity impact while their Iridium lens coating reduces glare and heightens contrast. Additionally, the Half Jacket XLJs are designed to allow for quick lens changing, making them appropriate for any lighting condition.