Of late, the USGA has been putting all sorts of rules and restrictions on club head design to prevent that very situation from occurring. This is why designers have to be more creative in designing clubs. One method is to design clubs around the way average golfers swing, rather than creating perfect clubs and expecting golfers to swing that way.
The most common tendency is when a golfer comes over the top and makes an outside-in move evident by most shots off the tee resulting into a push, fade or the dreaded slice. A Golf Digest article Add 42 Yards Now explained that if you were able to change to more of an inside-out movement a golfer who swung 95 mph could gain as much as 42 yards. Of course, this would require a huge change in how the person swings the club and lets face it most golfers are not going to be able to put in that time and effort. But through creating design features in the club head, the golfer can be encouraged to make more of an inside path.
This is how the Acer XDS Insider got its name. The profile of the head as well as the contour on the crown was specifically designed to create a mental picture of swinging from the inside to encourage one to swing the driver on an inside-out swing path instead of that dreaded distance robbing over-the-top move.
The XDS Insider also helps you in other ways. Internal weighting creates a draw bias shifting weight toward the heel to assist in rotating the head and squaring the face at impact. The face angle is a little more closed than normal to provide some additional corrective measures but cleverly disguised by the masking on the crown to provide a square appearance so they can just trust their natural swing. Lastly, the Acer XDS Insider also boasts a variable face thickness, cup face design to make the entire club face becomes one gigantic sweet spot and ensure all the distance possible.