Developed and designed by a surfing physician since 1977. Doctors recommend Proplugs. Prevents surfers ear, swimmers ear, and eardrum rupture. Helps ears equalize under water. Low price, high quality hypo-allergenic earplug. 8 preformed sizes for lifetime protection. No messy, sticky putty lost in ear canal. The ONLY earplug which does not disrupt earwax or obstruct the canal.