The ReSound Earmold is a custom-fitted hearing device component available through Costco Hearing Aid Centers. Earmolds are individually crafted from an impression of the patient's ear canal and outer ear, ensuring a precise and comfortable fit that improves sound quality, reduces feedback, and enhances retention of the hearing aid.

ReSound earmolds are typically used with behind-the-ear (BTE) and receiver-in-canal (RIC) hearing aid styles. The custom fit is achieved by a licensed hearing care professional who takes an ear impression — either via traditional silicone impression or 3D ear scanning — which is then used to fabricate the mold to the unique contours of each individual's ear anatomy. The result is a personalized, ergonomic fit that minimizes sound leakage and maximizes comfort during extended wear.

Custom earmolds can be made in various styles (full shell, half shell, canal, micro-canal) and materials (hard acrylic or soft silicone) to accommodate different degrees of hearing loss, ear canal shapes, and patient preferences. They are an important component for achieving optimal hearing aid performance, particularly for users with more significant hearing loss who need a tighter acoustic seal.