Golf shoes shouldn’t be too tight or too loose. They should fit snugly at the midfoot so your feet aren’t slipping around in the shoe. They should be snug in the heel, too, to help prevent rubbing and blisters, but not so tight that they hurt. The toe box should be wide enough that your toes can relax and spread easily, allowing a full and natural grip. Take measurements of both feet and use the larger of the two to determine your size; you can always add an insole to make up the difference. Check that the shoe's width accommodates the broadest section of your foot. If your shoes are too loose, your feet may slide when you swing the club. When swinging, a loose fit can cause you to lose your balance. If you want to play your best golf, stability is always key.