Not applicable. This is a gel device, not a topical product.
Source: Scholl product information.

Place between the toes as required. Wash with soap and water after use and allow to dry before reusing.

Hold toes apart and cushion where they rub
Slim enough to wear inside normal shoes
Soft gel rather than rigid plastic
Washable and reusable
Three per pack

For external use on feet. Do not apply over broken skin, open wounds or infected areas. Keep out of reach of children. Do not wear so tightly that circulation is restricted. Discontinue use if the area becomes more painful, red or swollen. If you have diabetes, poor circulation or reduced sensation in your feet, speak to a health professional before use.