Purpose: Foot deformities cause many negative effects such as pain, limitation in foot functionality, unbalanced distribution of plantar pressure. These negative effects create problems involving tendons, ligaments, muscles, nerves, and bone-joint tissues, affecting the whole body in the form of a chain. Custom made insoles can reduce the negative effects of foot deformities to a great extent. The aim of our study was to examine the effect of using custom made insoles on plantar load distribution, foot posture, and pain in heavy metalworkers. Materials and Methods: Of the 89 individuals working as heavy rolling mill workers in a factory, 25 people who met the inclusion criteria were included in the study. Insoles were applied using a computer-aided design and production method specific to deformities. Sociodemographic information of the individuals was recorded. Plantar load distribution was evaluated with bare feet using a static pedobarographic device (Sensörmedica, Italy), foot posture with the “Foot Posture Index” and pain with the “McGill Pain Questionnaire”. Measurements were repeated at the end of the 4th and 8th week in addition to the instantaneous measurement performed at the beginning of the intervention. Result: Individuals' instantaneous, 4th week and 8th week measurements were compared. There was a significant decrease in forefoot load distribution (p <0.05) and a significant increase in hindfoot load distribution (p <0.05). A positive significant difference was found between the foot posture index medians (p = 0.022). A significant difference was found in the direction of pain reduction due to the results of the Mcgill-Melzack Pain Questionnaire (p <0.001). Results: It was observed that the use of custom made insoles was effective in providing a balanced distribution of plantar load, correcting the foot posture, and reducing pain.