High degree of comfort and visibility when worn Patented polyurethane foam expands gently in the ear canal, reduces tendency to back out of the ear canal Less expansion pressure creates a more comfortable seal, wears more comfortably than other foam earplugs over long periods of time Smooth, soil-resistant skin prevents dirt build-up, promoting proper hygiene Tapered bullet-shape design easier to roll-down and insert, adapts more evenly to shape of the ear canal