The world's most-used polyurethane foam earplug. Bell shape delivers maximum in ear comfort. Contoured design easier to insert, resists tendency to back-out of ear canal Polyurethane foam enhances comfort, especially for long-term wear Smooth, soil-resistant closed cell-foam skin prevents dirt build-up Bulk refills for Leight® Source 400 and Leight® Source 500 earplug dispensers save time, waste and space 
