3M™ PELTOR™ X5 Earmuffs X5A/37274(AAD), Over-the-Head

Details
The 3M™ PELTOR™ X Series Ear Muffs X5A is a high performance hearing protector offering 37(dB) attenuation for use against extremely high noise environments , which often require double protection. Despite the larger cups the ear muffs remain relatively lightweight with excellent balance and wearer comfort.
HIGH ATTENUATION: Very high attenuation earmuffs recommended for high-noise exposure applications - NRR 31 dB CSA Class AL.*
Kit contains replacement sealing rings and muffler pads which can be replaced in a few easy steps
COMFORTABLE: Wide, soft foam ear cushions and earcup tilting pivot points designed for high comfort and an effective acoustic seal with the head.
EXTENDED COMFORT: Internal stainless steel wire in headband helps maintain consistent force over an 8-hour period for extended comfort. Twin headband design helps reduce heat buildup.
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What is the X5A SV version?