Described herein are hearing protection devices, such as, for example, push-in earplugs, and methods of making the hearing protection devices that have a distal cavity in the sound attenuating body. [Selection] Figure 3音波減衰体内に先端空洞を有する、例えば押し込み式耳栓等の聴力保護デバイス及びその聴力保護デバイスの製造方法が、本明細書に記載される。【選択図】図3