The Vitrex 33 3120 Ear Caps With Foldable Headband are multi-positional, meaning that they can be worn over the head, under the chin or behind the neck. The ear caps are suitable for most DIY and power tool applications and will fold small, for convenient pocket storage. Supplied complete with 2 pairs of replacement caps. Tested to European Standard EN352. Part 2. CE Approved. SNR Rating: 24 dB.