ISOTunes Sport Defy Slim Basic EarmuffsISOTunes Sport Defy Slim Basic Ear Defenders are lightweight ear muff style ear defenders with ISOTunes' innovative Tactical Hearing Protection for all round hearing safety when in high impact noise environments. Protect your hearing with these comfortable ear defenders that feature an ultra slim design for weight reduction and weigh 100g less than the industry standard. Although the Defy Slim Basics are not equipped with Bluetooth, they can still