The insole bottom is made of superior quality Gel material, which has strong shock absorbency. What's more, the insole could be trimmed according to actual needs without worrying about size problem. Meeting most of your need. Features: The bottom adopt GEL material, which has strong shock absorbency. The arch support pad on the insole will greatly correct flat foot. According to the free cutting line, the insole can be cut according to your shoes. Can be attached to various sports shoes, such as running shoes, hiking shoes, Fitness shoes, etc. Design for feet protection. Healthy insoles, and healthy life. Specification: Item Type: Insoles Material: PU material, Silica Gel, Ultra-fine Velvet Color: Blue, Purple Package Weight: 132-197g Optional Size: S: 35-40 M: 41-45 Function: Thickening, Soft, Comfortable, Breathable, Shock Absorption Package List: 1 x Pair of Insoles 1 x Pair of Insoles Package List 1The bottom adopt GEL material, which has strong shock absorbency 2The arch support pad on the insole will greatly correct flat foot 3According to the free cutting line, the insole can be cut according to your shoes 4Can be attached to various sports shoes, such as running shoes, hiking shoes, Fitness shoes, etc 5Design for feet protection. Healthy insoles, and healthy life