The one major limitation of using insoles for foot support is that they can only be used in enclosed footwear, such as sneakers, loafers, boots, etc. When it comes to sandals, slides, clogs, and other such footwear, insoles typically will not stay in place correctly. If you already have a pair of sandals that you love but want more support, shopping for a shoe insert is a great solution. However, if you're looking for new footwear and want to ensure that it will have the support you need, shopping for footwear with that support and cushioning built into the product is a better solution.