⚠️ The insole is 26cm, but the shoes must be 27cm to accommodate the insole. ⚠️ 【The Thinnest Ever on Amazon】 Experience the unprecedented thinness! 0.6mm and 0.8mm. Based on reviews, we've made further improvements to achieve both softness and high strength and resilience. Thick insoles are difficult to fit into shoes and put a significant strain on the toes and soles of the feet. Therefore, we've adopted the highest quality carbon to make the insole as thin as possible while maintaining its strength. It's used in aftermarket parts for famous foreign cars like BMW and Benz, as well as parts for sports bicycles. 【100% Dry Carbon】 There are two types of carbon manufacturing: wet carbon and dry carbon. Wet carbon has the advantage of being inexpensive to produce, but it tends to be heavy and not very strong. Dry carbon, on the other hand, has high manufacturing costs, but it achieves high strength and weight reduction. Premium carbon insoles are made of 100% dry carbon and will improve your performance. 【Resilience and Strength】 Carbon generates high resilience. It is resistant to bending stress and has a very strong force to restore itself. By utilizing this, you can increase the propulsive force when kicking off the ground while running, and achieve high performance in track and field events, ball games, etc. 【How to Use】 0.6mm is for everyday use, such as walking and light running. 0.8mm is for track and field events, such as running. 1.0mm is for outdoor ball games, such as soccer. 1.2mm is for indoor ball games, such as basketball. 【Size Selection】 Choose a size that is 1cm smaller than your shoe size. The same size may not fit.