cidos: concepto, propiedades y ejemplos Toda Materia JSP EVO Alta Baseworker With JSP Sonis Ear Defenders Hard Hat Kit Blue. Combining a hard hat and ear defenders in one package, this kit ensures that youll always have the necessary safety equipment on hand. Both components are genuine JSP products, guaranteed to be compatible. The mountaineering style helmet is EN 397 compliant, with a chin strap designed to release under force. Its also electrically insulated, and has an internal EPP liner for side impact resistance. The wheel ratchet adjuster gives you a secure fit. Sonis ear defenders attach easily to the hard hats universal accessory slots, and rotate up out of the way when youre not using them. We offer three different levels of hearing protection, depending on the model: Sonis 1: SNR 26 Sonis Compact: SNR 31 Sonis 3: SNR 36 The universal accessory slots also have a blanking plate that covers them when theyre not in use, blocking out dust and water.