Assos Mille GTS Spring Fall Jacket S11

The Assos Mille GTS Spring Fall Jacket is a mid-weight, endurance focused jacket built for cool, damp days where you want proper protection up front, but you do not want to feel you’re riding inside a bin bag. And it’s lovely; not quite perfect, and certainly expensive, but lovely nonetheless.

The Mille GTS is the sort of thing that makes you slightly resent your other jackets. Not because they’re bad, but because they suddenly feel a bit… guessy. For chilly, windy and maybe damp rides, this is the ideal.

On gritty Dartmoor climbs over the Christmas break, this was ideal: it kept the weather out, but without cooking me alive once the effort level rose. It’s not a full waterproof, and consequently it’s free to be this very polished balance of wind resistance, water repellence and breathability. It also has the sort of fit and feel that makes you understand why people keep buying Assos, even when their bank account is politely asking them not to.

This is designed as an endurance rider’s jacket for mild autumn and spring days (Assos says 12 to 20°C), days where wind protection and little bit of water resistance matter most. It uses four-way-stretch, windblocking softshell with a water-repellent coating across the chest and shoulders, while slim-fitting and ‘lightly compressive’ arms are insulated and, like the rear, is focused on breathability and effective wicking. The inner faces are very soft.

The net result is a jacket that feels thin and light in the hand, yet works like a much heavier garment when you are actually riding. It’s not bulky so it layers cleanly, and it moves with you rather than fighting every shoulder shrug and reach for the hoods.

It feels built for long base rides, big steady training days, and the sort of British conditions where the sky cannot commit to either ‘proper rain’ or ‘proper dry’. You can ride hard in it without instantly turning into a sweaty greenhouse, but you also get genuine protection where the wind usually does its worst.

In drizzle and short showers – the sort where you agonise over whether stopping to zip up was worth the loss of momentum – I found this excellent. The chest and shoulders in particular do a great job of fending off wind and road spray, which is usually what drains your warmth first.

In a proper, sustained downpour, the arms were the first place I noticed wetting through, and you do start to lose heat there sooner. The saving grace is that, once the rain backs off (or you crest a climb and get airflow again), the jacket dries quickly and recovers its comfort fast.

Where conditions change, intensity changes, and you want to stay comfortable without constant wardrobe management, this is great. Breathability is where it really earns its keep, and it never gets near feeling clammy, soggy and cold.

Personally I was happy with this on those 8 to 15°C days where you just want one reliable outer, rather than a complicated layering spreadsheet. That said, with a long sleeve base and a gilet it stayed comfortable at 4 to 5°C.

The fit? This is slim, sharp, and designed around a riding position that assumes you are at least slightly committed to going somewhere quickly. Assos describes the jacket as a ‘regular’ fit, but with the GTS element adding an aero focus. In reality, it’s a fairly racy fit.

Sleeve length is excellent, and they’re tight without a hint of restriction. Comfort is superb, with no flapping and no bunching, and the raw cut cuffs keep the wrists slim and friendly towards gloves and base layers.

I do have a gripe, however, and that’s the front length. For something marketed at endurance riding, I would have liked a touch more coverage at the waist. Sitting a bit taller on an endurance-focused bike can make the front here feel slightly short. Also, when you’re off the bike at café stops, your layering choices become everyone else’s problem too.

Despite using the Assos size guide to land on my usual Large, I found this a little tight through the chest. You may well want to consider sizing up, especially if you’re on the cusp or have plans to layer beneath this.

The details you notice after three hours

The collar is a standout. Assos calls it the struzzo Kragen (that’s ‘ostrich collar’ in Italian and German), and it’s a light, softly insulated thing designed to stay this side of boiling you into unzipping and blasting your throat with cold air. In practice it’s very comfortable, seals well and avoids that scratchy, stiff feeling some jackets get when they try too hard to be weatherproof.

Storage is solid. The three rear pockets are a good practical size, and crucially they hold shape well, resisting sag even when packed with winter snacks. There are reflective strips here, which helps a little, though I still wish Assos offered at least one genuinely bright colour for UK winter visibility. It’s this scheme pictured or Terra Sand (the panels are tan) or blackSeries (aka black).

The usual 30°C wash and air dry does just fine here, and despite receiving plenty of winter muck and road grime, the Future Dusk colour stayed looking fresh rather than permanently ‘seasoned’. Assos offers a two-year warranty and a crash policy – free repair or replacement within 30 days, the same service ‘reasonably charged’ after that – which is reassuring at this price.

Value

At £225, this is undeniably premium. The good news is it does not feel like a ‘because we can’ price tag. The fabrics, fit, comfort and performance are all right there at the sharp end, and it’s the sort of jacket you can realistically use a lot, rather than having to save for ‘best’.

It’s actually cheaper than some top-tier alternatives, such as Rapha’s Pro Team Shadow Winter Jacket at £325.

Its closest rival is the excellent Castelli Espresso Air Jacket, which is now £230.

Overall

This is a brilliantly judged jacket that nails a hard balance: it has proper wind and weather shielding, real breathability, and a soft, high quality feel throughout. It’s comfortable enough for long rides, technical enough for harder efforts, and refined enough to make you reach for it whenever the forecast looks indecisive.

The fit is on the aggressive side, and the price is not subtle, but if you want one jacket that makes late autumn and early spring feel less like a compromise, this is a very convincing choice.