Dirtlej Jackets

Fabric Tech and Weather Performance

A 20,000mm water column sounds like a spec-sheet number until you're caught in two hours of sustained Welsh hill rain and come out dry. That rating means the fabric can withstand a 20-metre column of water pressing against it before a drop gets through - comfortably beyond what most UK riding will throw at you. Dirtlej pairs that with fully taped seams and waterproof zippers, which is where cheaper jackets quietly fail. Seams are the obvious entry points for water, and if they're not sealed, a high waterproof rating on the face fabric alone is half the job.

Breathability is the harder balance to get right. Dirtlej targets a 10,000g/m²/24h breathability rating, which is meaningful on steep, humid climbs where a less breathable jacket turns into a portable sauna. That figure tells you how much moisture vapour can escape outward through the fabric in 24 hours - the higher it is, the faster sweat moves away from your skin rather than pooling inside. It won't match a dedicated softshell on a dry day, but for mixed-weather trail riding, it's a solid compromise. The DWR coating on the outer face also helps: it causes water to bead and roll off rather than soaking into the fabric and adding dead weight and chill. Keep that coating in good nick and the jacket works harder for longer. Laser-cut ventilation ports add targeted airflow where you need it most, without punching holes that compromise the waterproofing elsewhere.

If you want a comparison point, brands like Endura and 7mesh take broadly similar approaches at the technical end of the market - but Dirtlej leans harder into MTB-specific durability than road-derived cuts.

The Dirtlej Fit and What's in the Range

Fit is where Dirtlej separates itself from jackets borrowed from road or commute categories. The cut is relaxed and articulated - designed for an aggressive, forward riding position on the bike rather than standing upright. That means the back panel sits longer, protecting against rear-wheel spray, and the shoulders and arms are shaped to move with you rather than riding up when you reach forward for the bars.

The enduro fit also creates space for low-profile body armour underneath without the jacket going taut across your back or shoulders. Slim elbow pads and a back protector sit comfortably inside, which matters if you're riding anything technical where the armour isn't negotiable. It's not cut for bulky chest protectors - that's a different category - but for the standard trail-riding protection setup, it works well. The helmet-compatible hood is worth flagging too: it sits properly over an MTB lid without bunching, which means you actually use it during uplift queues or hike-a-bike sections rather than leaving it stuffed in the collar.

Dirtlej also makes Dirtlej Trousers and Dirtlej Overtrousers designed to work with the jackets as a matched system, which is worth considering if you're kitting out for full winter riding. And if you're after head-to-toe coverage in a single piece, the Dirtlej Skinsuits - their Dirtsuits - are a different animal entirely and worth a look on their own page.

On sizing: Dirtlej fits true to size in most cases, but if you're between sizes and planning to run armour underneath, sizing up gives you the mobility without pulling across the back.

Layering Properly and Keeping the Jacket Working

The jacket is only as good as what you put under it. On UK winter rides, a merino or quality synthetic base layer is the move - merino regulates temperature well and handles the stop-start rhythm of trail riding better than cotton, which just gets cold and wet against your skin. A mid layer depends on the day: a lightweight fleece or active insulation piece works for colder rides, but remember the jacket's breathability is finite. Stack too many layers and you'll still overheat on the climbs regardless of the ratings on the hangtag.

Washing is where a lot of riders quietly destroy their waterproofing. Hose the worst mud off outside before it dries and sets into the fabric - grit works like sandpaper on the DWR coating over time. Machine wash at 30°C using a dedicated technical wash cleaner; no bio-detergents, no fabric softeners. Both strip the DWR and degrade the breathable membrane faster than regular use would. After washing, tumble dry on low heat or iron on a low setting through a cloth - heat reactivates the DWR and restores the beading effect if it's started to wet out. If the jacket is soaking through rather than beading after washing, a spray-on DWR re-proofer applied to a clean, damp jacket will bring it back. It's a ten-minute job that extends the jacket's life significantly.

For a broader view of what's available in this space, Altura offer strong all-weather options at a range of price points if you're comparing across the market. Dirtlej's MTB baggy shorts are also worth pairing in during the transition months when full overtrousers feel like overkill.