People with poor feet feel and have a false sense of safety. They may experience blisters under the foot in 2 hours even if shoe size fits the length of the foot. In order to avoid any foot irritation or issues, please follow the table that first day: 1 hour wear 2 day: 2 hours (with 13 foot reference: recommended 3 hours on 4 day: 4 hours is recommended (with foot references after 2 hours day 5: It is recommended to wear all day long (with midday foot reference) or dark color on toes or bone spurs in the first five days: stop wearing shoes to end of day and start again the next day by following the chart if red or dark spot appears with each use, stop wearing shoes and contact the company for a professional review. Make sure to check your foot every day.