Scan Collapsible Ear Defenders are suitable for general purpose use. Effective in reducing noise levels, whilst still allowing the wearer to hear normal conversation. The soft and wide PVC ear cushions enhance comfort, and the adjustable cup height is designed to fit the majority of wearers. Foldable for easy storage. Conform to EN 352-12002 standard. SNR 28dB - Single Number Rating (SNR) = the number of decibels reduced by the product.