Ear molds are components of the hearing aid system that are designed to fit directly in the ear canal. This part of the hearing aid may not offer ACTUAL technology, but it still plays a big role. Ear molds are usually made of silicone or vinyl that is custom-made for the ear. For kids, a soft material (silicone) is recommended for comfort. Most of the time, kids’ ears get jostled and bumped a lot so a soft material for ear molds is really necessary.