6 Best Mountain Bike Helmet Under $100 for Trail Rides

The Exclusky Adult Bike Helmet is the best mountain bike helmet under $100 for most buyers, mainly because it offers a practical mix of adjustable fit, trail-ready coverage, and ventilation at a modest price. Its simple design suits riders who want everyday protection without paying for premium features they may not need.

This guide is for mountain bikers choosing a first trail helmet, replacing an old one, or shopping on a firm budget. Focus first on correct size and secure adjustment, then compare shell materials, rear coverage, visor design, and ventilation openings for comfort on longer climbs. The six picks below are ranked with clear reasons and honest drawbacks for each, so you can match protection and features to your riding style.

Quick Comparison

6 Mountain Bike Helmets Worth Buying

This ranked list counts down from sixth place to the top pick, with each helmet priced below $100.

6. Favoto Mountain Bike Helmet

Best for: Adult trail riders wanting easy fastening

This Favoto mountain bike helmet is an adult model in dark green, size L, designed for heads measuring 59 to 61 cm. It uses a dual-shell integrated PC construction over 20 mm of high-density EPS foam. At 335 g, or about 11.8 ounces, it is reasonably light for a trail helmet, though not among the lightest options available. The listed price is around $38, so it sits in the midrange for an everyday cycling helmet.

Its most useful detail is the magnetic buckle, which is intended for one-handed fastening and release. That may help when wearing gloves, but fit still depends on adjusting the straps correctly. An elastic cord at the rear can hold cycling glasses when you move between bright roads and shaded paths. The product listing says the helmet meets CPSC and CE standards. Those markings provide useful safety context, but they do not replace a correct fit or a helmet replacement after a serious impact. The L size also limits this model for riders outside its stated head range.

Pros

• Dual PC shell construction and 20 mm EPS foam add impact-absorbing material.
• Magnetic buckle allows quick one-hand closure and release.
• Rear elastic cord keeps sunglasses with the helmet between riding conditions.

Cons

• The 59–61 cm L size will not fit every adult head.
• At 335 g, it may feel heavier than lighter road-focused helmets.

Check Price on Amazon →

5. BATFOX Bike Helmet

Best for: Trail riders wanting broad coverage

The BATFOX is a full-coverage mountain bike helmet for adults and youth. Its polycarbonate outer shell connects to an impact-absorbing EPS foam liner, giving the helmet a two-layer construction for trail riding. The listing says it meets U.S. CPSC, ASTM F1447, and European CE bicycle helmet standards. At around $50, it targets riders who want more coverage than a basic road-style helmet without moving into premium pricing.

Ventilation is a clear strength on paper. Eighteen vents and internal air channels should help move heat during longer rides, while the large visor adds shade and some protection from light rain, dust, and branches. The fit system uses a rear adjustment dial, and the removable, washable pads include a chin pad. Three listed sizes cover M, 54–58 cm, L, 58–61 cm, and XL, 61–63 cm. That range suits many users, but measuring your head first remains essential. The classic colors and simple shape also make it easy to pair with most riding gear.

Pros

• Polycarbonate shell and EPS liner provide full-coverage impact protection.
• Eighteen vents with internal channels support airflow on warm rides.
• Removable, washable padding and a large visor add everyday practicality.

Cons

• The listing does not mention MIPS or another rotational-impact system.
• Only M, L, and XL sizes are listed, so smaller heads may not get a close fit.

Check Price on Amazon →

4. Schwinn Thrasher Adult Bike Helmet

Best for: Casual adult fitness and commuting rides

The Schwinn Thrasher is an adult bike helmet for riders ages 14 and up. Its adjustable size range covers heads from 58 to 62 cm. A rear dial tightens the fit, while the side and chin straps provide further adjustment. The microshell construction keeps the design light, and removable interior pads add cushioning around the head. Those pads can be removed for washing.

This helmet includes a removable visor for extra shade on sunny rides. Ventilation comes from 20 air vents in the main feature list, though another specification cites 21 flow vents. That small inconsistency is worth knowing. The moisture-wicking pads may help manage sweat during fitness rides, but this is still a basic recreational helmet rather than a high-end technical model. It complies with the U.S. CPSC bicycle helmet safety standard for people age 1 and older. At around $30, it targets buyers who want a recognizable brand and adjustable fit without paying premium helmet prices.

Pros

• The 58–62 cm range suits many adult head sizes.
• The rear dial makes fit adjustments quick and simple.
• Removable pads and visor make cleaning and sun protection easier.

Cons

• The product information lists both 20 and 21 vents, so the exact count is unclear.
• It lacks advanced fit or impact features found on pricier helmets.

Check Price on Amazon →

3. BATFOX Bike Helmet, Mountain Helmet for Adults and Youth

Best for: Casual trail riders needing broad coverage

The BATFOX mountain bike helmet uses a tough polycarbonate outer shell bonded to an impact-absorbing EPS foam liner. That combination covers more of the head than many low-profile road helmets, making it suitable for fire roads, bike paths, and moderate single-track riding. The listed price is around $50, though it can change.

Cooling comes from 18 vents with internal channels, which should help move air during longer rides. A large visor adds shade and some protection from light rain, dust, and low branches. The removable padding and chin pad can be washed, a useful feature for riders who wear a helmet several times each week. An adjustable dial lets you fine-tune the fit. Sizes include M for 54–58 cm, L for 58–61 cm, and XL for 61–63 cm head circumferences. The listing says the helmet meets CPSC, ASTM F1447, and E.U. CE standards.

Pros

• Polycarbonate and EPS construction provides full-coverage impact protection.
• Eighteen vents and internal channels support airflow on warm rides.
• Removable, washable pads make routine cleaning easier.

Cons

• The M size starts at 54 cm, so it may not fit smaller children.
• The product details do not state its weight, which matters for riders comparing lighter helmets.

Check Price on Amazon →

2. Mountain Bike Helmet for Adults

Best for: Trail riders wanting light coverage

This adult mountain bike helmet uses a high-density EPS foam core and a polycarbonate outer shell. Its in-mold construction joins those layers into one piece, while the deeper shape covers more of the back and sides than many basic road helmets. The manufacturer says it meets U.S. CPSC safety standards. At around $36, it offers a practical feature set for trail rides, commutes, and casual cycling.

At 330 grams, this is a relatively light option for regular riding. Seventeen vents and internal air channels help move heat away from your head, although ventilation will still depend on weather and riding speed. The removable visor can reduce glare on sunny routes, and the interior pads come out for washing. An adjustment dial, chin strap, and padded chin area help fine-tune the fit. Size M fits heads from 54 to 58 cm, while size L fits 57 to 61 cm. Measuring first matters because the two size ranges overlap only slightly.

Pros

• EPS foam, a polycarbonate shell, and in-mold construction provide the protection design described by the manufacturer.
• Seventeen vents, internal channels, and a 330-gram weight suit longer rides and daily commutes.
• The removable visor and washable pads make the helmet easier to maintain.

Cons

• Only two sizes are available, so riders outside the 54 to 61 cm range need another helmet.
• The visor is removable but not listed as adjustable, which may limit glare control for some riding positions.

Check Price on Amazon →

1. Exclusky Adult Bike Helmet

Best for: Casual commuters and weekend riders

The Exclusky adult bike helmet is a low-cost option for commuting, recreational cycling, mountain biking, and skateboarding. Its shell combines PVC and PC materials with an EPS foam layer, a common construction intended to help absorb force during a crash. The helmet uses a lightweight build and breathable inner pads, which should make longer rides more comfortable. At around $27, it targets buyers who want basic head protection without paying premium helmet prices.

Ventilation channels allow air to pass through the helmet, which may help reduce heat during rides. A single-hand adjustment dial lets riders tighten or loosen the fit while wearing gloves or holding the handlebars. The reinforced sun visor can move upward, giving more room in the rider’s field of view when needed. The design is unisex and suits several types of riding, but the product details do not list a specific size range. Fit will depend on the available adjustment and the shape of the rider’s head.

Pros

• PVC, PC, and EPS construction is designed to help absorb impact energy.
• Breathable pads and ventilation openings can improve comfort in warm weather.
• Rear dial and movable visor allow simple fit and sun-shield adjustments.

Cons

• The listed information does not identify a safety certification, such as CPSC or EN 1078.
• No exact head-size range is provided, so some buyers may struggle to confirm fit before ordering.

Check Price on Amazon →

Buying Guide

Fit is the most important factor when choosing a mountain bike helmet. A properly fitted shell stays level and secure during hard braking, rough trails, and falls.

• Head size and fit: Measure around your head, about 1 inch above your eyebrows, then match the result to the size chart. A common range is 21.5 to 24.5 inches, or 55 to 62 cm. The helmet should feel snug without pressure points.
• Safety certification: For U.S. trail riding, look for a CPSC sticker inside the shell. Riders who use jumps, drops, or downhill tracks should consider ASTM F1952 certification, if available in the price range.
• Coverage: Choose a shape with extra protection around the back and sides of your head. Trail helmets usually provide more coverage than basic road-style models.
• Retention system: The rear dial should adjust in small steps and stay locked during movement. Test the chin strap with two fingers of space beneath it, not a loose gap.
• Ventilation and features: Look for at least 10 vents for warm-weather climbs. A removable visor helps with sun and branches, while MIPS or a similar rotational-impact system can add protection when priced below $100.

If you must compromise, prioritize a correct fit and current safety certification over vents, graphics, or extra accessories.

Frequently Asked Questions

How do I choose a mountain bike helmet under $100?

Choose a mountain bike helmet under $100 with a snug fit, adjustable retention system, full rear coverage, and recognized safety certification. Look for CPSC or EN1078 approval, a size range such as 52–58 cm, and vents that match your riding climate. A dial should tighten without pressure points or helmet movement.

What features matter most in budget trail helmets?

Prioritize fit, impact protection, ventilation, and coverage when comparing budget trail helmets. A dial-adjusted retention system helps fine-tune pressure, while 15–25 vents can improve airflow on climbs. Look for coverage that reaches the back of your head, plus straps that lie flat around your ears.

Can I use a sub-$100 helmet for trail riding?

Yes, you can use a sub-$100 mountain bike helmet for trail riding if it fits correctly and carries the safety certification required in your region. For rough descents, choose a model with rear coverage, a secure chin strap, and optional rotational-impact protection such as MIPS.

Are cheap mountain bike helmets safe?

Affordable mountain bike helmets can be safe when they fit properly, meet a recognized standard, and remain undamaged. Replace a helmet after a serious impact, even if its shell looks normal. Check the production date, and consider replacing it after about five years, based on manufacturer guidance.

Conclusion

The Exclusky Adult Bike Helmet is the top choice for budget-minded trail riders who want basic coverage, adjustable fit, and a low purchase price. If your priority is added impact-management technology, choose a comparably priced MIPS-equipped helmet instead, since its liner may provide more protection during certain angled impacts. Before buying, double-check the size chart, helmet-to-head fit, compatibility with lights or goggles, listed quantity, and current price. A helmet under $100 still needs the right certification for your riding area and a secure chin-strap adjustment. Replace any helmet after a crash or when its shell, straps, or buckle show damage. The right pick should fit firmly without creating pressure points.