Size: S: 25cm long/L: 28cm long. (can be cut freely) 1.Arch Support: Flat foot orthopedic insoles provide support without changing the way your shoe fits. Built-in neutral arch support and double-layer cushioning are the perfect balance of comfort and support in a low profile design. With a specific arch shape, the insole supports the arch and heel, increasing stability and motion control to limit undue stress on the foot, ankle, joints and tendons. 2.Deep Heel Cup: These arch support insoles feature a deep, narrow heel cup to help support the foot during high-intensity activities and long distances. The stable deep heel ensures your feet are supported by them, suitable as an over-pronation insole for enhanced performance and physical activity. 3.Premium Fabric: The arch support is made of durable EVA foam base cushioning. Premium fabric reduces heat and friction for foot comfort. 4.Insole For All Day Standing: High arches, deep heel cups and double soles ensure reduced leg and foot muscle fatigue, making our work boot insoles ideal for people who stand for long periods of time, such as nurses or retail employees. Also suitable for sports, camping, hiking, running, etc. 5.Warning: After 3-7 days of wearing, your feet may feel pressure. This is normal because your feet are not used to arched support. We strongly recommend starting with 2-3 hours per day and gradually increasing the hours per day.