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Interior quietness has been improved over the years until it has now become an important fundamental performance requirement of vehicles. Simple approaches to assuring quietness include the addition of sound isolation materials or the provision of sound-deadening space. These approaches, however, have the undesirable effects of increasing the vehicle weight or sacrificing interior space. Previously, we investigated the effect of the fiber composition on sound isolation performance, focusing on polyester fiber material (nonwoven fabric), and researched sound-isolating materials that would not involve a weight increase. That work led to the development of a polyester fiber material with an optimized fiber composition. The material has been applied to a dash silencer that simultaneously achieves improved sound isolation performance and a lighter weight compared with previous materials. That technology provided the basis for developing a polyester fiber carpet pad.