An example orthotic is described which may include a cushioning first layer and a shell layer. The shell layer may be configured to extend longitudinally from at least the talus-navicular joint to the medial cuneiform-first metatarsal joint and laterally under at least the medial cuneiform bone when the orthotic is in use. The shell layer may be configured to receive a removable insert that alters an amount of arch support provided by the orthotic. A set of inserts may be provided to allow the example orthotic to be customized based on user support preferences.