New yellow and white Leight Stripe delivers 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, promote proper hygiene Tapered bullet-shape design easier to roll-down and insert, adapts more evenly to shape of the ear canal Ideal for medium/high noise environments of: The Bilsom 300 Series earplugs are ideal for workers who need to block out loud noise demand the best protection and comfort available in an earplug. Europe most-used polyurethane earplug, the 300 series earplug, offers superior noise-blocking performance in a single-use earplug.