Free-size insoles made of nickel, a rare metal, to suppress odors. Antibacterial activity value: "3.0" Excellent antibacterial performance. This product combines antibacterial power, durability, and immediate effect. Moreover, it can be washed and reused, making it economical. Highly recommended. *Free size, cut to your preferred size with scissors. Compatible with sizes from 22cm to 28cm. - Product Name: Nickel Working Insoles - Color: Gray - Size: Free Size - Features: Odor-suppressing function Thank you for viewing.