Pura-Fit ear plugs are tapered so they are easier to insert in any size ear canal. And they are longer too, so they are easier to grasp. More Comfort, Less Complaining. Pura-Fit is designed for increased compliance and fewer complaints. The special foam is formulated for softness and comfort, and the outer surface is smooth, so it doesn’t irritate the ear canal. NRR 33. Highest Independently Tested NRR Available. Features 100% PVC-Free. Highest Independently tested NRR 33. Tapered for easier insertion. Improved, softer foam for maximum comfort. Hygienically packaged in biodegradable paper pouches. Non-irritating, smooth surface. Longer length for easy fitting and removal. Look for the bright green color as a symbol of Moldex quality.