Foot inserts are generally typically used to deal with a variety of biomechanical disorders of the foot and lower leg. These foot orthoses are inserts that are used in the shoe to try and modify positioning of the feet in such a way that they help disorders in the feet and leg. These problems range from, for example, plantar fasciitis in the heel to shin splints that can occur in the legs of runners. All the research evidence shows that the clinical outcomes with foot supports are generally beneficial and most people that have foot orthotics are happy with them. However, foot orthotics can only ever do any good if you actually wear them. You do need to have suitable shoes to use them in and use them for long enough for the problem they were prescribed for to get better.
Among the issues with foot supports is that you need to use them in footwear. This may be a issue if you do not like using shoes or live in a warm climate where the using of shoes is difficult. In these environments people like putting on jandals (referred to as ‘thongs’ in Australia) that you can not really use with a foot supports. There are numerous options that are offered. Among those is to restrict the time that you're not using the foot orthotics, so that you wear footwear with the inserts for long enough and do not wear the flip flops too much so that the painful problem does not occur. Another choice is by using things like the arch support sandals or jandals like the Archie Thongs from Australia. These have some arch support included in them and can generally be used rather than foot orthotics. Shoes like the Archies will usually not be as effective as an adequately made foot supports, however they could be more than adequate to supplement them and use when the proper footwear can't or will not be worn.