- Size: 39/40 Donfri insoles are made of highly elastic materials and adapt to the shape of the foot. They offer high impact absorption and cushioning performance. Ergonomic design that effectively absorbs micro-vibrations and reduces daily pressure. Can be cut to size as needed. Ideal for work boots, daily and sports shoes. Recommended to replace every 3 months. Cleaning instructions: clean with a warm cloth (do not soak). Each piece contains a pair of Donfri sports insoles. Measurements: Width: 0 cm, Height: 0 cm, Length: 0 cm, Weight: 0 kg