How to Blend Engineering and Psychology to Help You Play Better

With our with irons and wedges it's so variable right like we don't on the course you're going to face that was a lot of words. But the performance is there so the challenge for us as equipment designers is how do you blend the engineering with the psychology with the may it makes you feel? We really need to understand is that helping players play better or is it just making them think they play better but not helping them at all, says Rory McIlroy.