An earplug extending along an earplug axis may include an outer portion and an inner portion. The outer portion may include a proximal portion extending from a second end region, a distal portion extending from a first end region, and a slant portion therebetween. The outer portion may define an interior space. The inner portion may extend between a first and second end region and may be coupled to the outer portion within the interior space. A distance between an end of the inner portion proximate the second end region of the inner portion and an end of the outer portion proximate the second end region of the outer portion may be greater than a length of the proximal portion of the outer portion measured along the earplug axis.
