The Superfeet Active Blue Capsule is the most versatile Trim-to-Fit insole in the Superfeet line. Because it's a little thinner, it works well in most lower-volume casual and sport (running, mountain biking, or tennis) shoes, or when you can't remove the inner sole from shoes. It is also ideal for flatter feet that may not tolerate the more supportive Performance Green Capsule. 1) Rear-Foot Control Point Only Superfeet 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 the Superfeet synergizer. 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 uses 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 Etc. Top Cover Only from Superfeet Significantly reduces friction and heat inside the shoe. The Superfeeet synergizer also keeps you cooler in summer and warmer in winter Result: less moisture, blistering and bacteria. 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). 2408, SUPERFEET ACTIVE BLUE SIZE D