3M Versaflo Inner Collar is designed to use with all use with all M-Series outer shrouds.3M Polyurethane Inner CollarSKU: M-444$71.96PriceQuantity*Add to Cart**SOLD BY THE CASE**3M Polyurethane Inner Collar (For Use With 3M Versaflo M-400 Series Helmets) (1 Per Case)