How to Choose an ISI Helmet: Fit, Marks and Fake Checks

Kota runs on two-wheelers: students riding to coaching classes, traders between markets, families on scooters in the evening. A helmet is the single most important thing you buy for any of those rides, and the roadside heaps of cheap helmets near busy junctions make it easy to buy the wrong one. This guide explains how to choose an ISI helmet: what the marks mean, how to check that they are real, and how to get a fit that actually protects you.

The rule in brief

• The Motor Vehicles Act requires people riding or being carried on a two-wheeler to wear protective headgear that conforms to the BIS standard, with limited exemptions.
• Under a Quality Control Order, two-wheeler helmets must be certified by the Bureau of Indian Standards (BIS) to IS 4151 and carry the ISI mark. Manufacturing and selling helmets without certification is not permitted.

So an uncertified helmet is not just risky; it is not supposed to be on sale at all.

Reading the marks

A genuine certified helmet carries:

1. The ISI mark (the Standard Mark).
2. The standard number, IS 4151.
3. A licence number in the form CM/L- followed by digits.

These are usually on a label inside the helmet or moulded or printed on the shell. Our general ISI mark guide explains the system in more detail.

Checking the licence

1. Install the BIS Care app from your phone’s official app store and check that the publisher is the Bureau of Indian Standards.
2. Choose the option to verify a licence and enter the CM/L number.
3. The result should show a valid licence, the licence holder and a product description that includes helmets.

If the licence is not found, is for a different product, or has expired, do not buy. Helmet stickers are easy to print; a licence record is much harder to fake.

Getting the fit right

A certified helmet that wobbles on your head will not protect you as designed.

1. Measure your head with a tape, just above the eyebrows and ears, around the widest part. Use the maker’s size chart.
2. Try it on with the strap fastened. It should feel snug all round, including the cheeks, without painful pressure points.
3. Shake your head side to side and up and down. The helmet should move with your head, not slide around it.
4. Push it upward from the back. It should not roll forward over your eyes.
5. Check the strap. Fastened under the chin, you should be able to fit about two fingers between the strap and your chin, no more.
6. Wear it for a few minutes in the shop. Discomfort that starts after two minutes will be worse after twenty.

Other things to check

• Shell: no cracks, deep scratches or signs of repainting. A secondhand helmet’s history is unknown, so buy new.
• Inner foam liner: firm and even. Crushed or crumbling foam means it will not absorb an impact properly.
• Visor: clear, free of scratches, and easy to open and close. A tinted visor can be a problem at night and in rain.
• Strap and buckle: firmly stitched and riveted; the buckle should click securely.
• Ventilation: in Kota’s summer heat, a well-ventilated helmet is one you will actually wear.
• Weight: a heavier helmet is not necessarily safer; a comfortable one gets worn on every ride.

Full-face or open?

A full-face helmet protects the chin and jaw, which take many impacts in falls. Open-face designs are cooler and allow better hearing and vision for some riders. Whichever style you choose, the ISI mark, licence check and fit come first.

When to replace a helmet

• After any crash or a hard drop onto a hard surface, even if it looks fine. The foam may be compressed inside.
• If the shell is cracked or the foam is damaged.
• If the strap or buckle is damaged.
• When the maker’s recommended service life is over.

Do not buy a used helmet and do not pass on a crashed one.

Students and parents in Kota

Many Kota students ride scooters for the first time when they arrive. If you are a parent, buy the helmet together, check the fit, and agree simple rules: a helmet on every ride, no riding without a licence, no triple riding. Our guide to buying a used bike in Kota covers the RC transfer and paperwork, and our student room essentials guide covers the rest of the move.

Buying smart

• Buy from a proper shop that gives a bill with the brand and model.
• Avoid roadside piles of helmets with no visible marks or licence.
• Keep the bill and warranty card; our warranty vs guarantee guide explains what they cover.
• If you were sold a fake, keep the helmet and bill and see our consumer complaint guide. Suspected misuse of the ISI mark can also be reported to BIS.

Looking after your helmet

• Do not hang it on the mirror of a parked scooter; drops and knocks add up.
• Clean the visor with water and a soft cloth, not harsh solvents that cloud it.
• Let the lining dry after a sweaty ride in summer or rain; many linings are removable and washable.
• Store it out of direct sun when not in use, as heat can age the shell and foam.

One rule to remember

A helmet works only if it is certified, it fits and it is fastened. Check the mark, check the licence, fasten the strap, every ride.