SuperFeet Synergizer Green Capsule, (or high profile) is the top of the Superfeet line. They are ideal for ski and snowboard boots, hiking boots and running shoes. As a rule, the Synergizer Green Capsule, offers you the most benefits because they are able build the most features into it to provide maximum balance, support and shock absorption. Only Superfeet provides features to control over-pronation, thus helping keep your foot correctly aligned. Resulting in less stress on muscles and joints. Superfeet uses its three-part Natural Shock Absorption System to naturally soften heel shock. This includes: (a) deep heel pocket to center fat pad (b) slight rocker bottom to allow for some foot roll (c) soft flange to allow for some soft tissue expansion Another Superfeet original, the Mid-Foot Control Point area stabilizes the mid-foot. Combined with the Rear-Foot Control Point, this enables you to use your skeletal strength to your advantage. This gives a very stable foot, creating less muscle fatigue and more endurance Patented Support Bridge feature activates all the control points for better balance and alignment during the stride. An essential feature exclusive to Superfeet. Long-Wearing Trocellen Foam, a high-quality, durable closed-cell foam gives long-lasting comfort for your pursuits. Patented Shape contours to your natural foot shape, which helps provide maximum contact with the ground results in a confident feeling of balance and control.