The Greatest Mountain Bike Helmets of 2024

How We Tested the Best Mountain Bike Helmets

We take cycling very seriously, and no matter what type of riding we’re doing, our safety is of the utmost importance. For that reason, a quality helmet is the most important piece of gear we put on before every mountain bike ride. We’re always seeking the most protective, comfortable, and best-looking mountain bike helmets we can find so we can have fun on the trails with the peace of mind a good helmet provides.

Our editorial staff has been testing the latest and greatest mountain bike helmets for over a decade. Sure, we’ve all got our favorites, but the market is ever-changing, with new and updated models coming out all the time. Fortunately, we get to try them all out, often before they are even available to the public. This experience has given us unique insight as to what makes a great helmet, along with the ability to discern the differences in performance and functionality between the different models we test. If you’re a roadie, our team has also thoroughly tested and reviewed the best road bike helmets, too.

Review author Jeremy Benson has been professionally testing and reviewing mountain bikes and accessories for the past 8 years. In that time, he has tried over 30 different helmets. Whether for XC rides, shuttle laps, or adventurous backcountry loops, he has honed in on the specific performance attributes that make a great helmet. For the purposes of this review, he tested 10 models side by side to directly compare things like fit, comfort, ventilation, coverage, and visors. Those findings, combined with models our editors have recently tested, are presented here to help inform your important mountain bike helmet purchase decision. In addition to helmets, Jeremy has also tested and reviewed the best cycling sunglasses to keep your eyes protected while you ride, clipless mountain bike shoes, and our favorite mountain bike shorts.

Mountain Bike Helmet Buyer’s Guide

There’s a lot to consider when choosing a new mountain bike helmet. Here we break down some important factors that may help with finding the right model to suit your needs.

Different Types of Mountain Bike Helmets

As there are several styles of mountain biking, there are just as many helmets to meet the needs of different riders. As the sport has evolved, so too has the protective equipment we use, and these days, helmets are safer than ever. In general, mountain bike helmets fall into three different categories and we explain the differences below.

Trail, All-Mountain, and Enduro Half-Shells

Half-shells for trail, all-mountain, and enduro riding are the most common type of helmets we see out on the trails. These “open-face” models cover the top of the head with modern shell designs offering extended coverage on the back and side of the head to better protect the occipital and temporal lobes. These helmets almost always have a visor (peak), and many are designed to work with both sunglasses and goggles. The added materials involved with extended coverage, visors, and other features typically result in helmets that are slightly heavier than their XC-oriented counterparts. Examples of modern trail riding helmets include the POC Kortal Race MIPS, the Troy Lee Designs A3 MIPS, and the Specialized Ambush 2.

XC Helmets

Cross-country riders and racers often prioritize lightweight and aerodynamics, so XC helmets are somewhat different than their trail-oriented counterparts. In fact, most professional XC racers are using what are technically considered road bike helmets. This style of helmet is typically sleek, low-profile, and well-ventilated, and they provide a bit less coverage of the head than the extended coverage models. They also generally do not come with a visor, although some riders will wear a cycling cap underneath to act as a visor in certain conditions. Examples include the Giro Aries and the POC Octal MIPS.

Full Face and Convertible Helmets

Full-face helmets provide the most head protection, with shells that extend over the ears and large chin bars that provide protection for the front of the face. Convertible helmets are those that have a removable chin bar, allowing the user to choose when they want half-shell or full-face coverage. This style of helmet has traditionally been worn by those in gravity-oriented disciplines like downhill and enduro racing, although a new breed of lightweight and well-ventilated models has expanded their appeal to a broader range of users. Full-face models now come in a range of designs, styles, materials, and weights, with models geared toward virtually every type of rider or protective needs.

Getting the Right Fit

A properly fitting helmet is critical for it to not only be comfortable but to work properly in the event of a crash. If it is too loose or too tight, its protective qualities may be compromised or its protective features may not function properly. Additionally, a properly fitting helmet is more comfortable, allowing you to focus your attention on the trail ahead. It is important to note that fit and comfort are subjective, and not every individual’s head shape will work with every helmet. If your head is very round, very narrow, or your forehead very pronounced, you will probably want to try a helmet on before buying it to ensure that it fits your specific head shape.

Sizing

Just like people’s heads, most helmets come in multiple sizes. Helmet manufacturers almost always have a size guide on their website for reference. Each helmet size typically fits a small range of head sizes, and these are usually shown as head circumference in centimeter measurements. As a general rule, the best way to determine if a helmet fits is to try it on before you buy. This will ensure you get the proper fit the first time.

If you are unsure of your head’s size, all you need to do is measure it. A flexible measuring tape is the best tool to do this. Otherwise, a length of string and a ruler will also do the trick. Measure the circumference of your head in a circle above the eyebrows, ears, and across the occipital lobe (back of the skull). Record this measurement in centimeters, and you should be able to identify the appropriate size helmet. Most adult helmets come in several sizes to cover heads ranging from 51-63cm in circumference (give or take), with each shell size covering a smaller range. For example, the Giro Manifest Spherical comes in three shell sizes: S: 51-55cm, M: 55-59cm, and L: 59-63cm. Most people will fall within one of these sizes. If you are on the cusp between sizes, it is typically better to size up than squeeze into the smaller shell size, in our experience.

If you get a helmet that is too tight or too loose, try to exchange it for the correct size before you wear it and get it sweaty or dirty.

Fit Adjustments

Most quality helmets have fit adjustment systems to help you dial them into your exact head shape to keep them stable, secure, and comfortable when in use. An adjustable harness is one such feature that is used to snug the helmet up against the occipital lobe/back of the skull. These harnesses usually have a small dial that you can turn to tighten or loosen it, and most have a vertical adjustment inside the helmet so you can be sure to position the harness properly under the occipital lobe as well. When tightened properly, the harness should feel snug but not uncomfortable and it should keep your helmet from bouncing around as you ride over rough terrain.

Likewise, the chin strap is another important adjustment that helps to keep your helmet on your head in the event of a crash. Too tight, and it can be uncomfortable. If it is too loose, your helmet can come off your head. Most chin straps can be tightened or loosened to fit your specific needs, and this adjustment is quick and easy to make. A general rule of thumb is to be able to fit a finger or two between the strap and your neck so that it is tight enough while still avoiding irritation. The straps should also split around the ears, and we prefer them not to touch our ears at all, if possible. Many strap splitters allow for some adjustment, so you can fit them to your ears for comfort.

Wear it Correctly

Even if you get a helmet that is the right size, it is important to wear it properly for it to work as intended. Modern helmets are designed to be worn level on the head and snug enough so that they don’t move around. Most of your forehead and the crown of your head should be inside the helmet, as opposed to the helmet sitting up too high or off the back.

How Mountain Bike Helmets Work

Mountain bike helmets protect the head by providing a barrier from direct impact and dissipating the forces from impact. At the most basic level, mountain bike helmets are comprised of two parts: an inner foam layer (usually EPS foam) and an outer polycarbonate shell. Combined, these layers provide a protective layer that takes the brunt of an impact. The firmer outer shell performs the important task of protecting the softer foam underneath and, when impacted, helps to spread the force of the impact over a greater area. The softer EPS foam compresses and absorbs those forces and it often crushes, cracks, or deforms in the process.

Always Replace Your Helmet After a Crash

Due to the fact that helmets are designed to partially destruct when absorbing the forces of an impact, they are meant to be replaced after a crash. Often, cracks or other signs of damage will be obvious, but not always. Even low-speed impacts can result in damage that can compromise the integrity and protective qualities of a mountain bike helmet. For your safety, it is recommended that you always replace your helmet after a crash. Thankfully, many brands offer discounts for crash-replacement helmets.

Rotational Impact Protection

Since the introduction of MIPS (Multi-Directional Impact Protection System) several years ago, rotational impact protection has become commonplace in mountain bike helmets. MIPS was the originator and is still the most common, although it has developed over the years into numerous iterations, such as MIPS SL, MIPS Evolve, MIPS Spherical, and MIPS Integra, to name a few. The basic idea, however, remains the same. MIPS and similar technologies strive to enhance head protection by reducing the rotational forces that reach the brain during certain impacts. They do this by creating a slip-plane that allows the helmet to shift around the head and absorb some of those forces before they reach the brain.

Many other brands have also developed their own rotational impact protection systems that are intended to work much the same as MIPS. 100%’s SmartShock system, used in the 100% Altis, relies on small rubber elastomers built into the shell that are intended to absorb both rotational and direct impact, and Leatt’s Turbine 360 works similarly. Bontrager’s WaveCel design features a zig-zag honeycomb-like structure that is intended to crumple and shear on impact, and KinetiCore was developed by Lazer to work in much the same way, with isolated columns of EPS foam.

Which one of these technologies works the best is hard to say, but we’re glad that helmet manufacturers are trying to improve helmet safety. We don’t have our own impact testing equipment, so we refer to Virginia Tech’s Bicycle Helmet Ratings for more insight. For years, Virginia Tech has been a leader in helmet impact testing, and they do it independently and provide their findings free to the public. They test each helmet for its ability to reduce linear acceleration and rotational velocity with 24 different tests. Of course, they haven’t tested every model on the market, but they do have 190 models of cycling helmets currently tested and rated on their site.

Coverage

As mountain bike helmets have evolved over time, the amount of head coverage has increased. For half-shell models like those reviewed here, this is most noticeable on the sides and back of the head, where the shells drop down further to better protect the sensitive temporal and occipital lobes. This is particularly apparent in trail, all-mountain, and enduro-oriented models that are often referred to as “extended coverage” half-shell helmets. Unlike old-school helmets that sat high atop the head, modern helmets now surround much more of the skull. Models like the Abus Cliffhanger, POC Kortal Race MIPS, Smith Payroll MIPS, and the Specialized Ambush 2 are great examples of this trend. In general, we typically equate more head coverage with better head protection, and we feel this is a welcome advancement.

Ventilation

Depending on the climate where you live and ride and how much you sweat, ventilation may or may not be a high priority. For those who live in warm climates, ride in the heat of the day, or simply perspire a lot, how well a helmet allows air to pass through to cool the head may be of the utmost importance. Not only does good ventilation reduce the amount of sweat running down your face or dripping onto your lenses, but it helps to keep you from overheating. Fortunately, most helmet manufacturers do their best to make their helmets well-ventilated, though they are not created equal.

While important, the number of vents is not the only factor when it comes to ventilation. Instead, a well-executed design that involves adequate air intake vents at the front of the head, internal channels that move air over the head, and exhaust vents at the back of the head for air to escape is generally the most effective.

Visors

Visors, sometimes referred to as “peaks”, are a common feature on most mountain bike helmets and they serve several purposes. Many visors are adjustable, allowing the rider to position them at various angles. This makes it possible to drop them down low to help keep the sun out of the eyes at low sun angles or move them up and out of the field of view at high sun angles. They also serve to deflect trailside branches and can help keep light rain from reaching the eyes while riding. Adjustable visors and those positioned higher on the helmet typically also accommodate a pair of goggles or sunglasses stashed beneath them when not in use. Some visors are also designed to break away in the event of a crash to reduce the chance of injury.

Eyewear Compatibility

Since most of us wear cycling sunglasses to protect our eyes while we ride, many helmet manufacturers are designing and marketing their helmets with integrated sunglass storage and goggle compatibility. It has long been the case that you could wear goggles with many helmets and stash sunglasses in the front vents, but now, these features are often a part of the design. The spacing of the front vents is pretty critical for stowing sunglasses, and some manufacturers have taken to adding rubber grips or other materials to better hold sunglass arms. At the rear of the helmet, many now feature a rubber strip or pad of some kind to add grip for a goggle strap. As mentioned above, visor adjustability or placement is also a factor when stowing either sunglasses or goggles when not in use.

Additional Safety Features

The whole point of making helmets for cyclists is to help prevent injury, and manufacturers are seeking additional ways to protect the people who buy their products. They do this in a variety of ways, including the implementation of new technologies. Brands like Specialized and ABUS make small crash detection sensors, called ANGi and QUIN, respectively, that can be attached to the helmet. These small units can sense the forces associated with a crash and send a notification to your contacts in an emergency situation. Likewise, Smith has partnered with Aleck and includes a crash sensor on several of their helmets, including the new Payroll MIPS. POC includes a twICEme NFC medical id chip in certain helmets, which can be read by first responders to find important personal, medical, and contact information if the individual is unresponsive or unable to communicate effectively.

As mentioned in the visors section above, some models have visors that are designed to break away in the event of a crash, which may help reduce the chance of injury. Other brands use structural reinforcement in their designs, such as aramid bridges or ActiCage integrated into the EPS foam to add strength. The foam itself can be varied, with some companies using dual-density foams like EPS and EPP, which absorb the energy from high and low-speed impacts differently. Koroyd is another interesting material used by brands like Smith and Endura. This honeycomb-like structure is intended to crush and crumple on impact while remaining porous and allowing air to pass through and heat and moisture to escape.

Durability

Unless you crash often or are careless with your gear, helmets tend to have a pretty good lifespan. Quality helmets have in-mold constructions with the inner foam well bonded to the outer shell, and most now have full shell coverage over the lower edge of the foam. Exposed foam is more susceptible to damage, so the more it is covered, the better. The durability of the outer shells of helmets can vary, however, with some being quite resilient and others being more prone to denting if struck by a branch or dropped in a truck bed with too much force, for example. Remember, your helmet may prevent serious injury or even save your life, so treat it with care.

If you don’t ride that often, most helmets will last for several years without issue. If you ride every day, you’ll probably want to replace your helmet more frequently, every couple of seasons or so. Always remember, if you crash and impact the helmet, it should be replaced.

Value

Mountain bike helmets vary wildly in terms of price, with the models we tested ranging between $75 and $300. Sure, many of the more expensive models feature the latest and greatest technology, lighter weights, and flashier designs. The reality is that any of these helmets will protect you better than none at all, and even the least expensive model we tested, the Specialized Camber, beats many of the costlier models in Virginia Tech’s impact testing and looks pretty darn good doing it. So, you don’t have to spend a lot for quality head protection, but it’s your head and brain we’re talking about here, so you make the call.

Frequently Asked Questions About Mountain Bike Helmets