Lower peak attenuation in most cases, but a far more repeatable fit - and in practice that often means better real-world protection.

Foam depends on rolling technique and insertion depth, which vary every time.

Flanges are pre-formed, so the plug seats at the same depth on each insertion.

The wearer can feel whether it has seated, which foam does not provide.

Across a workforce, average achieved protection is what matters rather than the peak figure.

Where very high attenuation is genuinely required, well-fitted foam or a muff still wins.

No rolling, no waiting for expansion, and they can be refitted in seconds.

Work that involves conversations, phone calls or moving between noisy and quiet areas means plugs come out repeatedly.

A foam plug removed and refitted needs rolling again and clean hands.

A flanged plug goes straight back in and seats.

That makes it far more likely to actually be refitted rather than left out.

Corded versions keep the pair together between uses, which reinforces the same behaviour.

Mild soap and water, dried thoroughly, and kept in their case - the case is part of the product.

A plug carried loose in a pocket is not reusable in any meaningful sense.

Detergents, solvents and alcohol wipes can degrade the flange material and are generally avoided.

Plugs should be dry before storage, since damp cases encourage growth.

Cleaning frequency follows the environment - dusty and dirty work needs it daily.

Anyone with an ear infection or discharge should not be using reusable plugs at all.

Weeks to months depending on use and cleaning - they are consumable rather than permanent.

Flanges harden, tear and lose their seal over time.

A plug that no longer feels like it seats has stopped working and should be replaced.

Discolouration, stiffness and visible splits are the obvious indicators.

Heat, sunlight and chemical exposure all shorten life.

Replacement cost is low relative to the consequence, so erring early is sensible.

More flanges generally seal a wider range of canal shapes, at some cost in comfort.

Triple-flange designs are the common general-purpose configuration.

Additional flanges give more chances to seal against an irregular canal.

They can also feel more intrusive, particularly on long shifts.

Stem design matters as much - longer stems are easier to insert and remove, flatter stems sit better under a muff or helmet.

Sizes exist and are as under-used here as with foam plugs.

Yes, and dual protection is used where noise is very high - but the effect is not additive.

Combining plugs and muffs gives less than the sum of the two ratings.

Most schemes provide a method for estimating the combined figure, and it is conservative.

A flat-stemmed plug is more comfortable under a muff cushion than a long-stemmed one.

Dual protection increases isolation, so the over-protection question becomes more acute.

It is appropriate in genuinely extreme noise and unnecessary below that.

Anyone with an ear infection, discharge or a canal condition, and anyone who cannot achieve a comfortable seal.

Inserting anything into an infected ear canal makes the condition worse.

Some people find any in-ear product intolerable over a full shift.

Earmuffs are the alternative and require no insertion at all.

Ear canals differ enough between people that standard sizes will never fit everyone.

Custom-moulded plugs address that, and offering an alternative is more effective than insisting on one product.