Ear defenders for autistic adults and teens: what SNR to buy and why

What to look for in ear defenders

Good ear defenders cut enough noise for the job, clamp firmly without aching, and are light enough to leave on. These are the numbers and features that matter.

• SNR, in decibels. The Single Number Rating is the lab-measured cut. The 3M Peltor X4A is 33dB. Alpine Muffy Kids cut up to 25dB. For comparison, Loop Quiet 2 earplugs are 24dB SNR.
• Clamp and cushions. Muffs seal by pressing round your ears, so fit decides comfort. 3M describes the X4A as a slim double headband with soft, wide sealing rings. Wear any new pair round the house for 20 minutes before you commit.
• Weight, in grams. Lighter is easier to wear for longer. Alpine Muffy Kids weigh 100g. We could not confirm the weight of the X4A or the Vanderfields from the pages we checked.
• Certification. Look for EN 352, the European standard for hearing protectors. The X4A is certified to it.
• Portability. A muff that folds goes in a bag and gets used. The Muffy Kids fold and come with a storage bag.
• How they look. Workwear muffs look like workwear. Muffs in a plain colour draw fewer questions on a bus than hi-vis yellow.

How much noise reduction do autistic adults need?

Usually less than the biggest number on the shelf.

The National Autistic Society describes how sounds can seem much louder, and sudden noises more distressing, for autistic people who are hypersensitive to sound. Its list of common triggers includes loud speech, electrical humming, unexpected noises such as alarms and sirens, and background noise. Most of those are everyday sounds, not industrial ones.

The Health and Safety Executive (HSE), writing for workplaces, says to avoid protection that brings the sound at your ear below 70dB, because speech and warnings get lost and people take the protection off. On paper, a 33dB muff in a room running at 75dB leaves about 42dB at your ear: very quiet, and a long way under that line. That is why many people end up with two things: a lighter option for the supermarket or the office, and the X4A for the hoover, the hand dryer and Bonfire Night.

A sensible way to choose:

• Everyday rooms (shops, offices, stations): 20 to 26dB, or noise-cancelling headphones for steady hum.
• Short, loud spells (hoovers, drills, fireworks, school sports halls): 30dB and up.

Ear defenders or noise-cancelling headphones?

Passive ear defenders are rated, need no battery and handle sudden loud noise; noise-cancelling headphones are unrated and work best on steady drones.

The NAS lists both ear defenders and noise-cancelling headphones among the sensory tools autistic people use. Noise cancelling works by listening to the noise around you and playing back an opposing signal, which is most effective on constant, low sound such as engines, fans and air conditioning. It does less for a sudden bang or a nearby voice. Headphones do add options muffs cannot: music or silence, and a transparency or ambient mode so you can hear an announcement without taking them off.

The trade-offs are cost, weight and charging. The soundcore Q31i is 265g and needs a charge every 50 hours of use with noise cancelling on. The X4A never needs charging at all.

What about teenagers?

Smaller teens usually fit children's muffs better; bigger teens fit adult ones.

Alpine sizes Muffy Kids for ages 5 to 16. They cut up to 25dB, weigh 100g and fold into a bag, which matters for anything carried to school. Vanderfields sell their budget muffs for adults and teens. The X4A adjusts, but it is built as workplace protection for adult heads, and it blocks more than a teen is likely to need for a school hall.

If a teen is choosing, let them choose the colour. A pair they are happy to be seen in gets worn.

Things to know

• Do not wear them all day, every day. NHS advice on hyperacusis is that wearing earplugs or ear muffs all the time can make you more sensitive to noise. Short spells in very noisy places are the intended use.
• Glasses break the seal. The arms of glasses can stop the cushions sealing, which cuts the real-world reduction below the rating.
• The X4A is workplace kit. Its specification is written for industrial noise, and replacement hygiene kits for the cushions are sold separately. It works at home; it is just built for protection first.
• The Vanderfields rating is unclear. The Amazon listing quotes 35dB at 2kHz, which is a figure at one frequency, not an SNR. Vanderfields' own site lists its adult V-Slick muffs, which come in army green, at 26dB SNR. We could not confirm that the listing is that model.
• We have not tested these. Ratings and weights are the makers' and retailers' figures.