The Alpkit Gravitas is one of those rare jackets that manages to combine true waterproof protection with ultralight packability. Designed for people who need full weatherproofing without the bulk, it sits in that sweet spot between minimalism and functionality. Weighing just around 180 grams, it’s one of the lightest 3-layer waterproof shells available, yet it feels more substantial and protective than many jackets in its weight class.
Alpkit’s goal with the Gravitas is clear: to create a jacket that performs as a genuine waterproof shell, not just a “just-in-case” layer. It’s built for mountain runners, fast hikers, and bikepackers — anyone who wants reliable protection without compromising speed or comfort. The result is a jacket that feels impressively refined and capable, despite its featherweight design.
Design and Construction
The Gravitas is made from a proprietary 3-layer fabric that combines a lightweight ripstop nylon face with a waterproof membrane and a soft tricot backing. This construction gives it a premium feel — smooth, supple, and slightly stretchy — rather than the crinkly stiffness typical of many ultralight shells. It packs down small enough to fit in a running vest, cycling jersey pocket, or side pouch of a pack.
The overall cut is athletic but not restrictive. There’s enough room for a light base layer or thin midlayer underneath, but it still feels trim and efficient. The seams are fully taped for waterproof integrity, and the zips are water-resistant throughout. The main YKK Aquaguard zip runs smoothly, even with cold or wet hands, and there’s a small storm flap behind it to add an extra layer of protection.
A standout feature of the design is its simplicity. There are no unnecessary extras — just a hood, two zipped hand pockets, and a single chest adjustment. Everything feels intentional, with a focus on reducing weight without compromising performance.
The minimalist aesthetic is balanced by subtle detailing: small reflective accents, neat stitching, and understated branding. It’s functional but stylish, suitable for both trail and travel.
Waterproofing and Breathability
The Alpkit Gravitas uses a 3-layer fabric rated to 20,000 mm hydrostatic head, putting it squarely in the “serious waterproof” category. It’s designed to handle prolonged rain and heavy downpours rather than just light showers. During testing in sustained rain, it held up remarkably well. Water beaded and rolled off the surface rather than soaking in, and the internal membrane kept moisture at bay.
The durable water repellent (DWR) coating is effective, and because it’s a PFC-free treatment, it’s environmentally safer than older fluorocarbon-based coatings. After a few washes and reproofs, it continues to perform well, showing Alpkit’s attention to long-term usability.
Breathability is rated at 25,000 g/m²/24hr, which is excellent for a 3-layer shell of this weight. In real-world use, that translates into a jacket that vents well during high-output activity. Whether running in cold drizzle or fast hiking with a loaded pack, it manages internal moisture effectively.
While no waterproof shell can completely eliminate condensation during intense movement, the Gravitas performs admirably. The inner tricot lining helps wick moisture away from base layers, reducing that clammy feeling often associated with ultralight rain jackets.
Hood and Adjustability
The hood is one of the most important components of any waterproof jacket, and Alpkit has clearly put thought into its design. It’s fully adjustable with a rear cinch that allows a snug fit around the head or over a lightweight helmet. The brim is laminated and structured, helping to keep rain out of the eyes even in strong wind.
When tightened, the hood moves naturally with the head, avoiding the “tunnel vision” effect that plagues many minimalist jackets. The elastic around the opening provides a seal without feeling restrictive, and when not in use, the hood sits flat against the back.
The cuffs use simple elastic bindings rather than bulky Velcro tabs. This keeps weight low and prevents snagging, while still providing a secure fit that seals out wind and rain. The hem has a single adjustable drawcord that can be cinched to prevent drafts when moving quickly in exposed conditions.
Fit and Comfort
Fit is where the Gravitas really stands out. Many ultralight jackets compromise on comfort to save weight, but this one feels surprisingly natural to wear. The 3-layer fabric offers just enough flexibility to move with the body rather than against it, and the cut provides excellent mobility in the shoulders and arms.
When running or cycling, there’s no riding up at the hem or restriction in reach. The sleeves are long enough to cover wrists even when arms are stretched forward, and the articulated elbows add to the overall freedom of movement.
The inside of the jacket has a soft-touch tricot layer that feels pleasant against the skin. This is a big advantage over 2.5-layer jackets, which often have a plastic-like feel that can become sticky when sweating. Even in short sleeves, the Gravitas remains comfortable.
At around 180 grams (depending on size), it’s almost unnoticeable when worn. The light weight makes it ideal for carrying on long runs or multi-day adventures where every gram counts.
Pockets and Storage
The Alpkit Gravitas features two zipped hand pockets positioned high enough to remain accessible when wearing a backpack or running vest. They’re generous enough to hold gloves, a small phone, or snacks, and they double as ventilation points if left slightly open.
The zips are water-resistant and run smoothly, adding convenience without compromising waterproofing. There’s no dedicated stuff sack — instead, the jacket packs neatly into one of its own pockets, forming a small bundle that fits easily into any pack.
This simplicity works well for its intended purpose. Everything you need is included, and nothing unnecessary adds weight or clutter.
Performance on the Trail
In real-world conditions, the Gravitas performs exactly as expected from a premium ultralight shell. During long trail runs and mountain hikes, it provided reliable protection from persistent rain and wind. Even in high humidity, it maintained a comfortable internal climate thanks to its excellent breathability.
On steep climbs or high-output efforts, condensation did build slightly, but it never became uncomfortable. The fabric’s quick-drying inner surface helped moisture evaporate as soon as conditions eased.
Windproofing is excellent, with the jacket cutting through gusts without feeling suffocating. On colder, exposed summits, the Gravitas worked effectively as a barrier layer over a thin fleece, keeping warmth in while blocking wind chill.
The combination of low weight, small pack size, and high protection makes it a reliable companion for everything from trail running to bikepacking and alpine hiking. It’s the kind of jacket that disappears into a pack until you need it — and then impresses every time you do.
Durability
Ultralight gear often trades longevity for weight savings, but the Gravitas strikes a good balance. The 7D nylon face fabric isn’t as tough as heavier mountain shells, but it’s stronger than it looks. It resists abrasion from light pack straps and brushes with vegetation surprisingly well.
After repeated use and several washes, the jacket shows minimal wear. The zips and seams remain tight, and the waterproof membrane maintains its integrity. For its weight category, durability is a real strong point.
Of course, this isn’t a jacket for heavy mountaineering or scrambling over rock — its lightweight fabric isn’t designed for that kind of abuse. But for running, hiking, or cycling, it’s more than tough enough.
Sustainability
Alpkit has built a strong reputation for ethical and sustainable practices, and the Gravitas reflects that philosophy. The jacket is made with a PFC-free water repellent coating, avoiding harmful chemicals. Alpkit also provides repair and reproofing services, encouraging longer product lifespans and reducing waste.
It’s refreshing to see a performance brand combining technical innovation with environmental responsibility.
Value for Money
For a 3-layer ultralight shell, the Alpkit Gravitas is competitively priced. Comparable models from premium outdoor brands often cost significantly more without offering noticeably better performance. The Gravitas delivers high-end waterproofing, breathability, and comfort at a price that feels fair and accessible.
Considering its build quality, versatility, and long-term durability, it offers excellent value for people who spend time in unpredictable weather but don’t want to carry unnecessary weight.
Pros
- Genuine 3-layer waterproof construction
- Excellent breathability and comfort
- Ultralight and highly packable
- Well-balanced fit with great mobility
- Effective hood design with good weather protection
- Environmentally friendly PFC-free coating
- Competitive pricing
Cons
- Lightweight fabric requires care around sharp objects
- No pit zips or dedicated venting system
- Not ideal for heavy abrasion or climbing use
Verdict
The Alpkit Gravitas Ultralight 3-Layer Waterproof Jacket is a superb example of smart design and functional minimalism. It delivers full waterproof protection and impressive breathability in a jacket that weighs less than many wind shells.
Its comfort, fit, and thoughtful details make it a standout choice for fast-paced adventures where weight and pack space matter. While it’s not designed for rugged mountaineering, it’s perfect for trail running, fast hiking, bikepacking, or alpine travel where weather protection and mobility are key.
For people seeking a true ultralight waterproof that performs like a much heavier shell, the Alpkit Gravitas is one of the best options available. It’s reliable, comfortable, and built with long-term sustainability in mind — a jacket that proves less really can be more.
