6 New Radians Defender Hearing Protection Earmuffs. This is a new set of 6 pairs of Radians Defender hearing protection muffs. The adjustable headbands slide to fit most sizes. The foam filled padded ear cups fit securely and comfortably over the ear. These are lightweight, dielectric and have durable construction. When it comes to hearing protection, Radians is unsurpassed in selection, quality, delivery and value.