The iconic days of downhill racers wearing full-body protective suits are long gone. Mountain bike protective gear has evolved – it is lighter, more breathable, and, crucially, comfortable enough that riders who aren’t downhill racers, are now choosing to wear it.
Choosing the right chest protector is a balancing act between protection, mobility, and ventilation. Pick wrong and you’ll own a protector that only sees daylight on shuttle days. Pick right and it becomes part of your everyday kit – quietly doing its job while you focus on riding better, faster, and with more confidence.
We put two popular options head-to-head: the Leatt ReaFlex Chest Protector and the Leatt 4.5 Hybrid Chest Protector, to see where each one shines.
Read: Leatt’s new 2026 gear range
Leatt ReaFlex Chest Protector
Leatt’s ReaFlex Chest Protector is targeted towards trail riders looking for extra protection on the trails. ReaFlex is a reactive impact gel which hardens on impact, becoming firmer at higher impact levels. The Chest Protector It is lightweight, breathable and flexible which has helped Leatt create a product that almost feels as though it disappears once you’re riding. It’s the kind of protector you forget about – arguably the highest compliment you can pay safety gear.
Pedalling feels natural, airflow is excellent, and the soft, reactive ReaFlex protector inspires confidence without feeling restrictive.
There are moments, however, where the single shoulder-spanning panel that connects the chest and back plates can ride up slightly when seated – especially while sitting in shuttle vehicles or during longer pedals. It’s not uncomfortable, but it can feel a touch awkward despite the protector’s low weight.
Coverage around the ribs is excellent, wrapping around your sides in a way that makes you feel just a little braver dropping into that next run. The removable section of the rear neck-brace interface can occasionally catch on jerseys when getting dressed, which may have you wishing for an extra set of hands – but riders already running a neck brace will remove this panel won’t notice this at all. Leatt’s BraceOn system connects to neck braces keeping everything snug, secure and well connected.
- RRP: $359.95
- Best for: Enduro racing, safety conscious trail riders and gravity-focussed riders who are comfortable with slightly less protection.
Pros:
- Light weight
- Excellent ventilation
- Great neck brace integration
Cons:
- Removable neck brace panel can catch jerseys
- Single piece shoulder panel is stiff out of the box
Leatt 4.5 Hybrid Chest Protector
First impressions on the 4.5 Chest Protector are solid! Pulling the 4.5 Hybrid from Leatt’s environmentally friendly compostable cornstarch packaging, it immediately feels heavier and more solid than the ReaFlex.
The hard-shell front paired with a softer rear panel delivers serious protection. The adjustable shoulder and side straps make dialling in comfort simple. Once set up properly, the chest and back plates move independently which feels comfortable and helps the chest protector’s bulk largely fade into the background – all that remains is a feeling of being extremely well protected.
This is a protector that prefers to live over a jersey or with a base layer underneath. Worn directly against skin under a jersey, it has a habit of rubbing – resulting in unexpectedly smooth patches that may leave you looking beach-ready after day one.
Ventilation is decent for the amount of armour on offer, but there’s no escaping the fact that this is a warm piece of kit. Heat builds quickly, and long pedal days aren’t its happy place. Shuttle runs and lift-accessed laps are where it shines. With this much protection wrapped around you, confidence comes easily – and speeds tend to increase.
Like the ReaFlex, the 4.5 Hybrid uses Leatt’s BraceOn system and integrates seamlessly with neck braces.
Overall, for those looking to really level up on larger features, or racing enduro or downhill you can’t beat the solid protection of the 4.5 Hybrid.
- RRP: $429.95
- Best for: Downhill days, bike-park laps, shuttle runs, big-commitment riding, and riders who prioritise protection over pedalling comfort.
Pros:
- Adjustable shoulder straps
- Fantastic protection
- Inspires confidence
Cons:
- Heavy-duty construction comes with weight penalty
- Less ventilation
Read: 30 pairs of mountain bike gloves tested for mountain biking
Our Take
Modern protective gear has reached a point where the trade-offs are refreshingly small. For riders who love descending, chest protection is no longer just a race-day decision.
The ReaFlex is so light and breathable that wearing it while pedalling feels entirely reasonable. While the one-piece construction can occasionally feel slightly awkward, it’s something that eases with time as materials bed in.
The 4.5 Hybrid goes the other way – big and unapologetically protective, that comes with an increase in weight and heat. It offers outstanding coverage and comfort once adjusted, but heat buildup makes it a poor choice for long pedally missions. When uplifts are doing the work, this chest protector is right at home.
Which one do I choose?
Both of these Leatt chest protectors are excellent, well-designed products that earn their place in a rider’s gear bag.
If your riding involves trail rides or pushing the pace with mates during pedal mission, the Leatt ReaFlex Chest Protector is the clear choice. If your idea of a perfect day involves chairlifts, shuttles, and maximum commitment on the descents, the Leatt 4.5 Hybrid Chest Protector delivers confidence in spades.
Overall we were impressed with the technicality, quality and fit of Leatt’s chest protectors, which should be on the list of protective items for those looking to send it on the trails!
