What key measurement is critical in determining the correct size for custom orthotics?

Determining the correct size for custom orthotics requires a comprehensive understanding of various foot measurements, all of which play a critical role in achieving a proper fit. Foot length is essential, as it ensures that the orthotic aligns appropriately with the overall size of the foot, preventing unnecessary pressure points or discomfort. Foot width is equally important, as it accommodates the broader parts of the foot, ensuring stability and preventing excessive movement within the shoe, which could lead to blistering or other complications. Lastly, arch height is crucial in supporting the foot's natural biomechanics, influencing how weight is distributed across the foot and how effectively the orthotic can correct any specific foot issues. Each of these measurements—foot length, foot width, and arch height—collectively contributes to creating a custom orthotic that enhances comfort, function, and support. Therefore, all of these measurements are integral to ensuring an effective orthotic solution.