Superfeet Performance Green Insoles are at the top of the line. The ideal footbed for ski and snowboard boots, hiking boots and running shoes. As a rule, the Superfeet Performance Green offers you the most benefits. That's because Superfeet was able to build the most features into it to provide maximum balance, support and shock absorption. It's their most popular footbed. 1) Rear-Foot Control Point Only Superfeet synergizer insoles provides this feature to control over-pronation, thus helping keep your foot correctly aligned. Result: less stress on muscles and joints. 2) Mid-Foot Control Point Another Superfeet original. This area stabilizes the mid-foot. Combined with Rear-Foot Control Point, this enables you to use your skeletal strength to your advantage. Result: a very stable foot, creating less muscle fatigue and more endurance. 3) Patented Support Bridge This feature activates all the control points for better balance and alignment during the stride. An essential feature exclusive to Superfeet. 4) Long-Wearing Trocellen TM Foam We use only high-quality, durable closed-cell foam. Result: long-lasting comfort for your pursuits. 5) Natural Shock Absorption System Only Superfeet synergizer insoles use this three-part 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. Result: a soft landing every time. 6) New Holofiber Top Cover Only from Superfeet Significantly increases oxygenated blood flow thereby improving circulation and muscle energy. SUPERFEET SIZING CHART. Men's: 5.5-7 (C), 7.5-9 (D), 9.5-11 (E), 11.5-13 (F), 13.5-15 (G), 15.5-17 (H). Women's: 4.5-6 (B), 6.5-8 (C), 8.5-10 (D), 10.5-12 (E). Kid's: 11.5-13 (J), 13.5-2 (A), 2.5-4 (B).