Made of plastic material. Allow the circulation of air under the foot, which prevents sweating to strong overheating of the foot. The grid lightly massages the foot from below. These inserts are used primarily in the military, trekking etc. No cutting is required. These inserts are pre-cut to size at the factory. Fit easily into walking shoes, hiking boots, trainers, sports shoes, work shoes, casual pumps, kids shoes, etc.
