Bottom Line
The Black Diamond Fineline Stretch (men’s / women’s) earns consideration from hikers who value movement and a relatively light package at a midrange price. Its mobility and practical weather resistance make it a useful alternative to stiffer rain shells.
At $190 it is not as inexpensive as the REI Rainier, but it offers a different balance of low weight, fit flexibility, and protection. Buyers regularly confronting severe storms should compare its weather-resistance tradeoffs with heavier three-layer models.
For more options, see our Best Rain Jackets guide.
How We Tested
Miles Knotek tested the Fineline Stretch in Alaska’s rain, sleet, and snow. During an early-winter wet hike he checked the trim fit over insulation, then assessed whether the waterproof zipper, taped seams, and long pit zips helped manage storm protection and moisture buildup. Repeated wear also provided evidence about abrasion, delamination, zipper function, and retained waterproof performance.
Quick Specs
Black Diamond Fineline Stretch
Lightweight & Affordable Rain Jacket
CleverHiker Rating: 4.3/5.0
Price: $189
Listed Weight: 11.3 oz. / 9.5 oz.(men’s / women’s)
# of Vents: 2
Pros
- Stretch encourages movement
- Moderate weight
- Two ventilation openings
Cons
- Not a standout in severe-storm protection
- Less durability evidence than established shells
- $190 has stiff competition
Comfort & Mobility
Stretch fabric and underarm gussets allow unrestricted movement while scrambling, climbing, and hiking. The trim fit is appealing for slender torsos but made it difficult for our tester to layer over anything thicker than a medium-pile fleece during an early-winter Alaskan hike. It is therefore better for active or summer use than bulky cold-weather layering.
The early-winter Alaska hike exposed the narrow fit’s limits: only modest fleece layers fit comfortably beneath it. With less insulation, however, underarm gussets and stretch allowed wide reaches and scrambling without binding. Buyers who need a bulkier winter midlayer should try this jacket on instead of assuming stretch guarantees room.
Comfort & Mobility Score: 4.3/5.0
Weather Resistance
During Alaskan rainstorms, the Fineline’s BD.dry fabric and taped seams kept precipitation out. Its waterproof front zipper limits a common leak point, while adjustable cuffs, hem, and helmet-compatible hood improve coverage. A tall collar deflects wind and drips, though it can feel oversized for casual use.
Waterproof zipper construction adds protection beyond the membrane and taped seams. A tall collar and helmet-compatible hood helped keep wind-driven rain away during testing. Those details make it a credible backcountry shell, although the taller collar can feel excessive in casual use.
Weather Resistance Score: 4.2/5.0
Ventilation
Large pit zips extend down the torso, helping release heat during strenuous hikes. The inner fabric felt less plasticky against sweaty skin than some inexpensive two-layer designs. The Fineline is not the most breathable shell tested, but it provides a useful balance between ventilation and staying protected.
The interior stayed more comfortable against damp skin than a basic two-layer shell. Long pit zips allowed adjustments without opening the whole jacket to rain. This is a useful balance for active backpackers who want a trim cut without surrendering airflow.
Ventilation Score: 4.3/5.0
Durability
CleverHiker observed no delamination, scratches, or tears after repeated testing. All zippers continued working despite their fine teeth, and there was no noticeable decline in rain protection. Its thin fabric therefore proved more durable on trail than its appearance alone might suggest.
The zipper teeth continued functioning and no delamination appeared after repeated use. Water protection had not measurably deteriorated either. These observations support treating the Fineline as a dependable lightweight backcountry shell, rather than simply a flexible jacket for brief showers.
Durability Score: 4.2/5.0
Weight
Our men’s medium weighed 10.1 ounces, making this a lightweight choice for active outings. The trimmer cut and relatively thin materials help keep the jacket light and compact. It packs into its own right pocket, making it a convenient layer to carry close at hand.
Its right pocket doubles as the storage pouch, helping keep the jacket organized and readily accessible in a loaded pack. At just 10.1 ounces, it still includes a waterproof front zipper, protective hood, or pit zips. These features make it a strong compromise for hikers who value movement and portability more than the absolutely lowest possible mass.
Weight Score: 4.4/5.0
Should You Buy the Black Diamond Fineline Stretch?
The Fineline Stretch deserves a look if a flexible rain shell at a moderate weight is your priority. Its ranking suggests a balanced general-purpose jacket rather than one that leads the field for storm protection or durability.
At the same price, the Patagonia Torrentshell 3L brings a much more thoroughly documented history of heavy-rain use. Buyers who value that testing record over stretch should favor the Patagonia.
What Other Rain Jackets Should You Consider?
If you want to check out our complete list, you can see all of our recommendations in our guide to the best rain jackets. If you like some things about the Fineline but still want to explore, here are some similar models we recommend.
Patagonia Torrentshell 3L Review: At the same $190 price, the Torrentshell supplies documented heavy-rain performance and long-term durability. Its bulkier, stiffer build is the main reason a mobility-focused hiker might prefer the Fineline.
REI Rainier Review: This saves $90 and offers everyday features including pit zips and an adjustable hood. It is a budget choice rather than a match for prolonged severe-weather protection.
Mountain Hardwear Stretch Ozonic Review: The Stretch Ozonic is another mobile shell, with softer, quieter fabric and excellent freedom of movement. It is a compelling choice when all-day comfort is the priority.
