The Core Difference
The fundamental difference between a full face and open face MTB helmet is the chin bar. A full face helmet has a rigid chin guard that protects the jaw, chin, and lower face. An open face (also called a half-shell or trail helmet) leaves the face exposed below the forehead.
That single difference has significant implications for protection, weight, ventilation, and which riding disciplines each helmet suits.
Full Face MTB Helmets
What They Protect
Full face helmets protect the entire head including the chin and jaw — zones that are frequently impacted in high-speed crashes. Studies of MTB injuries consistently show that facial and jaw injuries are common in downhill and bike park riding, where speeds are higher and crashes more violent. A chin bar can be the difference between a bruised chin and a broken jaw.
Who They're For
- Downhill (DH) riders — full face is the standard for DH. High speeds, technical terrain, and the consequences of a crash make chin bar protection essential.
- Bike park riders — jumps, drops, and features create face-first crash scenarios that open face helmets don't protect against.
- Enduro racers — many enduro riders use full face helmets on descents, particularly on technical or high-speed stages.
- Riders who've had facial injuries — once you've broken a tooth or jaw in a crash, the calculus on chin bar protection changes permanently.
Trade-offs
- Weight: Full face helmets are heavier than open face. Modern designs have reduced this gap significantly — the Demon Podium X MIPS® weighs just 710g, which is competitive with many open face trail helmets.
- Ventilation: The chin bar reduces airflow to the face. On long climbs in warm weather, this can be uncomfortable.
- Communication: Harder to hear and be heard with a chin bar in place.
Demon Full Face Options
- Demon Podium X MIPS® Helmet — 710g, four certifications (CPSC, CE EN 1078, ASTM F1952-22, ASTM F1447), MIPS rotational protection. The benchmark full face for gravity riding.
- Demon Podium Full Face Helmet — full face protection at an accessible price point.
- Demon FR Link Youth Full Face Helmet — full face protection for younger riders, with a removable chin guard for versatility.
Open Face MTB Helmets
What They Protect
Open face helmets protect the skull, temples, and back of the head — the same zones as a full face, minus the chin and jaw. For trail riding where speeds are moderate and crashes are more likely to involve sliding than direct face impacts, this coverage is often sufficient.
Who They're For
- Cross-country (XC) riders — lower speeds, longer climbs, and a crash profile that rarely involves face-first impacts make open face the standard choice.
- Trail riders — the majority of trail riders use open face helmets. The weight and ventilation advantages are significant for all-day riding.
- Enduro riders on mellow terrain — if your descents are moderate and you're not hitting large features, open face is a reasonable choice.
- Commuters and casual riders — open face is the standard for non-gravity riding.
Trade-offs
- No chin/jaw protection: The most significant limitation. If you crash face-first, your chin and jaw are unprotected.
- Better ventilation: Open face helmets run significantly cooler, which matters on long climbs.
- Lighter weight: Less material means less weight, which reduces neck fatigue on long rides.
- More comfortable for all-day wear: Easier to communicate, eat, and drink on the trail.
Demon Open Face Options
- Demon Podium with MIPS® — trail-optimized open face helmet with MIPS rotational protection and excellent ventilation.
The Convertible Option: Removable Chin Guard
Some helmets offer a removable chin guard — giving you full face protection on descents and open face comfort on climbs. This is a popular choice for enduro riders who want versatility without owning two helmets.
The Demon FR Link Youth Helmet features a removable chin guard, making it a versatile option for younger riders who ride varied terrain.
How to Choose: A Simple Decision Framework
| Your Riding | Recommended Helmet |
|---|---|
| XC / cross-country | Open face |
| Trail riding (moderate terrain) | Open face |
| Trail riding (technical, fast) | Open face or convertible |
| Enduro (mixed terrain) | Convertible or full face |
| Bike park / jumps / drops | Full face |
| Downhill / DH racing | Full face (ASTM F1952 certified) |
| E-MTB (high speed) | Full face recommended |
What About MIPS? Does It Matter for Both Types?
Yes — MIPS (Multi-directional Impact Protection System) is relevant for both full face and open face helmets. MIPS adds a low-friction slip liner that allows the helmet to rotate slightly on angled impacts, reducing rotational force transmitted to the brain. Since angled impacts are the most common type in real crashes, MIPS is a meaningful upgrade regardless of helmet style.
Read our full guide: MIPS vs Non-MIPS Helmets — What's the Difference?
Do You Need Both?
Many serious riders own both — an open face for trail days and a full face for bike park and DH sessions. If your riding spans both disciplines, this is the most practical approach. The cost of a second helmet is modest compared to the cost of a facial injury.
Shop MTB Helmets at Demon United
Full Face:
- Demon Podium X MIPS® — 710g, four certifications, MIPS
- Demon Podium Full Face
- Demon FR Link Youth — removable chin guard
Open Face:
- Demon Podium with MIPS® — trail-optimized, MIPS
Shop All MTB & Electric Helmets →
Related guides: