First, don't take any of this as gospel, go do your own research and make your own decisions. This is the knowledge I've collected after 40+ years of riding and racing on track and dirt. I'm not going into the differences between street/dirt/ADV helmets, it's up to you to make those decisions. I personally think you look awesome wearing your Shoei Hornet on your Yamaha R1!

The first thing you need to know about helmets is that worrying about the brand is silly. There are many great helmet manufacturers out there and if you just get caught up on buying a particular brand you will end up missing out on some great helmets. At a minimum, make sure your helmet meets a recognized safety standard like DOT or ECE. Beyond that, construction and fit matter more than logos

Now, when people shop for a helmet, they usually focus on comfort or brand. That’s backwards.

A helmet is an engineered safety system. Every layer has a job—and understanding those jobs is how you choose the right helmet, not just a cool-looking one.

We’re going to break it down from the outside in:

1. Shell (your first line of defense)
2. Impact-absorbing liner (the real lifesaver)
3. Comfort liner (what you actually feel)

Shell

The outer shell isn’t just there to look good, it has three critical jobs:

• Distribute impact forces across a larger area
• Prevent penetration (road debris, curbs, etc.)
• Manage sliding across pavement (reducing rotational forces)

This is your head's first line of defense, and is definitely important, but in many ways your shell plays just as large of a part in the comfort equation. The lighter it is, the less fatigued you will get riding. The more aerodynamic it is the less wind buffeting you'll feel and the less sore your neck will be.

Plastic Shells

• Usually called Thermoplastic or Polycarbonate
• These are your entry-level to mid-tier helmets

Pros:

• Affordable
• Durable (won’t crack easily)

Cons:

• Heavier
• Flexes more under impact
• Requires thicker shells to meet safety standards

First off, there is nothing inherently wrong with a plastic shell, I've seen a guy slide under a truck and it roll over his head in a bottom of the barrel HJC and be fine. The main differences are mostly going to be in weight, and size. Plastic shells are thicker and weigh more, and because they flex more, they rely more heavily on the EPS liner to manage impact energy.

If you are riding 90-95% on surface streets under 60mph, go ahead and save the money. If you are riding exclusively dirt, absolutely ok to go with plastic.

Composite Shells

• Usually made of Fiberglass, Carbon Fiber, Aramid/Kevlar (or some witches brew of all three)
• These are found in mid to high-end helmets

Pros:

• Lighter weight (less neck fatigue)
• Higher strength-to-weight ratio
• Better at spreading impact energy
• Thinner shell = more room for impact liner

Cons:

• More expensive
• Can crack under severe impact (this is actually by design)

Composite shells are engineered to break in a controlled way, dispersing energy before it reaches your head. This allows the inner layers to be thinner. In addition to this many manufacturers are using multi-layer blends of material in order to optimize protection (Carbon fiber for stiffness, fiberglass for some flex, Kevlar for puncture resistence). It stands to reason that these manufacturers are also evaluating other properties more closely in composite shells, which is why we see aerodynamic improvements in the composite shells get filtered down into the plastic shells later.

To wrap up the Shell portion, once you've determined the shell that fits your needs, start looking at how many shell sizes there are in the helmets you are considering. If a manufacturer is making 1 shell size, but offering that helmet in sizes Small to Large, then you know that the smaller sizes are going to look massive. If they are making 3 shell sizes then look at where your size falls in that shell system. If the shell for your size Medium helmet does both Small and Medium, then that's a win, if it does Medium and Large, then it might not be. But remember, the more shell sizes, the more costly that helmet is to produce. So, like with everything else, there are pros and cons.

Impact Liner: The Part That Saves Your Brain

This is the part most riders completely overlook, and it’s the most important part of the helmet. I do not say this lightly either. The impact liner is the unsung hero of your helmet, if all that matters was slide protection, we could make them out of leather or wood. But then we'd just transfer that kinetic energy straight to your head.

So there's only one place to begin.

Expanded Polystyrene (EPS) Foam

That stiff foam inside your helmet is designed to crush.

Why that matters:

• It converts kinetic energy into deformation
• It slows your head down over a longer time
• That reduction in deceleration = less brain injury

Now that we have that out of the way, let's talk about the more advanced solutions.

The real conversation we are here to have is about Single-Density vs Multi-Density EPS. So let's break it down.

Single-Density (cheaper helmets)

• One uniform foam hardness
• Compromise between soft and hard impacts

Multi-Density (better helmets)

• Softer foam for low-speed impacts
• Harder foam for high-speed impacts
• Strategically placed zones

Because of the differences and what a MASSIVE difference MD/EPS can make in even small collisions, my recommendation is that whatever you choose, demand Multi Density EPS. Even on less expensive helmets where the MD/EPS hasn't been "tuned" to the same level as the more expensive ones, it is going to give you an outsized bang for your buck. I wish when shopping on Revzilla, VisorShop, ect there was a filter button to filter out SD/EPS helmets. It would be the first button I'd select.

Advanced Systems (MIPS, Rotational Energy Management)

Some helmets include systems like:

• Slip-plane layers
• Internal rotational dampening structures

These are designed to reduce rotational acceleration, which is strongly linked to concussions. Brand differences aside, the presence of a rotational energy management system is what matters. Reducing rotational acceleration is a real and meaningful improvement in modern helmet design.

Comfort Liner: Fit, Feel, and Fatigue

This is the part that people think matters the most, but for safety it's the least important. For comfort? Well that's a different story!
What the Comfort Liner Does

• Creates the fit and seal around your head
• Wicks moisture
• Reduces pressure points
• Stabilizes the helmet at speed

Let's face facts, a $1,000 helmet that fits poorly is worse than a $300 helmet that fits perfectly.

What “correct fit” feels like:

• Snug everywhere (no loose spots)
• No pressure points after 10–15 minutes
• Cheek pads press firmly into your face
• Helmet does NOT rotate independently of your head

There is an old saying that "If a helmet feels ‘comfortable’ in the store, it’s probably too loose." I've found this to be true, those cheek pads will break in and if it feels perfect when it's new, then it will be too loose in a couple of weeks.

Head Shape Matters

Helmets are built for different head shapes:

• Round oval
• Intermediate oval (most common in the U.S.)
• Long oval

My wife was sure she wanted a Shoei for her first helmet (good job on the marketing Marc Marquez!), so she bought one. After our first long ride together she had a obvious pressure point on her forehead and a screaming headache. She had bought a helmet that didn't fit well because the hype was good. Luckily she was able to sell it fairly easily and went in and spent a couple of hours trying on helmets (10-15 minutes at a time) until she found one that fit her head comfortably. She's had that helmet for a couple of years now and loves it, we do multi-hour rides without any issue. This is why I said at the beginning, there are many more important things than brand.

Final note, something is better than nothing. I want everyone to wear a helmet on every ride. I have a brother who is a quadriplegic from a motorcycle crash. We can never know what would have happened if he had been wearing his helmet, but with the nature of his injuries I'd bet it would have been orders of magnitude less.

If all you can afford is a cheaper helmet, than get the cheaper helmet. Something is better than nothing.