When choosing a shoe insert to address your plantar fasciitis, consider what kind will work best for your footwear. Most factory insoles can be removed from athletic shoes. Once out, you have the perfect, flat surface to snugly lay your therapeutic insoles. While some insoles are pre-fit, meaning you order the right size for your shoes, others can be cut and shaped to fit your feet exactly. Both options are fine—just choose which type you prefer.