100 Percent Jerseys

Fabric Tech and How It Handles UK Conditions

The core story across the 100% jersey range is moisture management. The fabrics are engineered to wick sweat away from your skin and push it outward - critical when you're grinding up a humid woodland climb in the Trough of Bowland or the Forest of Dean, where the air barely moves and your heart rate tells a different story to the gradient. Moisture-wicking alone isn't enough, though, and 100% knows it. Strategic antimicrobial mesh paneling is placed across the back and underarms, targeting the zones that overheat first and keeping airflow moving even when you're barely moving yourself.

What makes these jerseys genuinely suited to UK riding is durability. Fade-resistant sublimated graphics mean the colours are locked into the fabric rather than sitting on top of it - so repeated scrubbing to shift Peak District grit or Quantocks clay won't turn your jersey into a washed-out rag after six months. The materials hold their structure through frequent washing cycles, which, let's be honest, is non-negotiable when you're riding twice a week through autumn. On select models, abrasion-resistant sleeve materials add an extra layer of resilience for those moments when your arm finds the ground before your brain registers the corner.

Flatlock stitching throughout keeps seam bulk to a minimum, which matters under 100 Percent body armour or a chest protector - no pressure points, no rubbing on long days out.

Breaking Down the Range and Getting the Fit Right

100% runs three main jersey lines, each with a distinct purpose. The R-Core (and its harder-wearing sibling, the R-Core X) is the downhill and BMX-facing option. It's cut looser, uses heavier abrasion-resistant sleeve materials, and is built for the kind of riding where a slide-out is a realistic possibility rather than a worst-case scenario. If you're spending your weekends at a bike park or racing enduro stages, this is the jersey that makes sense.

The Celium line takes things in a different direction. Lighter, more stretch-forward, with 4-way stretch fabric and a focus on maximum airflow - it's the choice for trail and XC riders who want something that moves with them rather than around them. The 100 percent Celium jersey fit is noticeably more athletic than the R-Core, sitting closer to the body without restricting arm movement. Worth knowing if you're coming from a looser-cut jersey: it's not tight by road cycling standards, but it's trimmer than you might expect from an MTB jersey.

The Airmatic sits between the two - all-mountain versatility, relaxed enough for a full day in the saddle, breathable enough for technical climbs. Think of it as the jersey you'd reach for when you're not sure what the ride's going to throw at you.

As a rough guide, 100% jerseys run true to size across the range. A medium fits like a medium. If you're planning to wear bulky body armour underneath, go up a size for unrestricted movement - more on that below. The drop-tail design on all models means you get proper rear coverage when you're bent over the bars, not a gap between your jersey and shorts every time the trail kicks up.

Looking for youth sizes? Check out our 100 Percent Kids Clothing range. For casual post-ride wear, browse our 100 Percent T-Shirts and Shirts.

If you want to compare fit and build quality against another strong option in this space, Alpinestars jerseys offer a similarly considered approach to enduro-focused cuts and are worth a look for context.

Layering, Sizing for Armour, and Keeping the Kit Clean

UK riding means dressing for four seasons in one morning, sometimes literally. The 100 percent short sleeve jersey works well across spring and autumn when paired with a lightweight thermal base layer underneath - the moisture-wicking fabric still does its job, pulling sweat through the base layer and away from your skin. For colder mornings at trail centres in December, a 100% long sleeve MTB jersey is a more straightforward answer: you get coverage without the faff of an extra layer bunching up under your arms.

If you're running a chest protector or a full D3O vest under your jersey, size up. Not because the jerseys are cut small, but because the layered fit changes completely once you add a structured armour piece - armholes that work fine over a base layer can feel restrictive once there's a hard shell involved. The R-Core and Airmatic are both cut with enough room to handle low-profile soft armour at your stated size; hardshell downhill kit is where the size-up advice really applies.

Washing these jerseys correctly matters more than people tend to think. Cold or warm machine wash (check the label, but 30°C is usually safe), turn them inside out to protect the sublimated graphics, and keep them away from fabric softener - it clogs the moisture-wicking fibres and kills the antimicrobial treatment over time. If a jersey has an internal goggle wipe, don't scrub it hard or bleach it. Air dry where you can; tumble drying on low occasionally won't ruin them, but regular heat cycles will shorten the life of the stretch fabrics faster than any amount of mud will.

Pair your jersey with 100 Percent MTB baggy shorts and 100 Percent gloves for a cohesive kit setup, and don't overlook their goggles if you're running a full-face lid - the internal goggle wipe on select jerseys is designed with exactly that combination in mind.