Abstract: An arch support may include a base plate having a base plate top surface. The arch support may further include a contoured arch plate attached to the base plate at a joint. The arch plate may include an arch plate bottom surface. The arch plate bottom surface may face and be separated from the base plate top surface, with an extent of the separation increasing toward a medial side of the arch support.

Abstract: A tunable rigidity insole with interchangeable stiffeners includes an arch pad main body and three rigid stiffeners. The arch pad main body includes a set of first to third engaging holes, and at least one or two of these three rigid stiffeners will be selected to assemble into the engaging holes on the arch pad main body. The three rigid stiffeners provide supports to lateral longitudinal, central and medial longitudinal arch portions respectively. The first, second and third rigid stiffeners have at least two engagement members for each stiffener, and the engagement members have engagement extensions with a partial length component toward another engagement extensions at the end of stiffeners thereof respectively. The engagement members engage with the arch pad main body corresponding to the engaging holes respectively.

Abstract: An arch support may include a base plate having a base plate top surface. The arch support may further include a contoured arch plate attached to the base plate at a joint. The arch plate may include an arch plate bottom surface. The arch plate bottom surface may face and be separated from the base plate top surface, with an extent of the separation increasing toward a medial side of the arch support.

Abstract: A golf instruction aid and method of providing a tactile feedback to a golfer to remind the golfer to observe the proper weight shift during a backswing. The golf instruction aid includes a generally flat main body portion adapted to slip between the instep of the golfer and the golfer's shoe. A first flange extends underneath the foot of the golfer, while a second flange projects outward from the foot of the golfer above the rim of the shoe. The first flange exerts a slight pressure on the instep of the golfer's foot to remind the golfer to maintain his or her weight on the instep during the backswing. In one embodiment, the first flange is positioned generally underneath the second flange and is positioned to apply pressure to the arch of the foot. In the second embodiment, the first flange is positioned forward from the second flange and is positioned to apply pressure to the arch closer to the ball of the foot.