These 3M 90540 Economy Earmuffs (NRR 20) are a lightweight and cost-effective solution for moderate noise environments, providing essential hearing protection without the bulk of professional-grade models.

• Noise Reduction Rating (NRR) 20: While these offer slightly less attenuation than your NRR 25 folding earmuffs, an NRR of 20 is perfect for lower-decibel tasks, such as light hand-tool use, general shop work, or environments where you need to hear colleagues' voices more clearly while still dampening steady-state background noise.

• Economy Design: The "economy" designation highlights the streamlined construction. These are less complex than the folding versions, making them a great "backup" pair or a dedicated set to keep in a stationary tool chest. They are minimalist, reliable, and get the job done without unnecessary features.

• Comfort & Fit: Despite being an economy model, they feature an adjustable headband to ensure a secure seal around the ears. Proper sealing is the most important factor in how much protection you actually receive, so these remain highly effective for short-to-medium duration tasks.