Black Diamond StormLine Stretch Rain Pants vs Rab Downpour Eco Pants

Editorial Team
Last modified at July 3, 2026
When it comes to choosing the right rain pants for hiking, the Black Diamond StormLine Stretch Rain Pants and the Rab Downpour Eco Pants are both excellent options. Each has its strengths, catering to different needs and preferences. This comparison will help you understand which pants might be best suited for your outdoor adventures.

Why You Can Trust Us

  • Side-by-side analysis based on real user feedback
  • Unbiased comparisons, not influenced by partnerships
  • Updated as new data becomes available

We may earn from affiliate links at no extra cost to you.

Black Diamond StormLine Stretch Rain PantsRab Downpour Eco Pants
Black Diamond StormLine Stretch Rain Pants
Rab Downpour Eco Pants
Hydrostatic Head

10,000 mm (BD.dry fabric-family rating)

20,000 mm

Denier

Not specified by source

50D

Weight

11.2 oz

7.9 oz

Material

100% nylon with DWR / BD.dry stretch fabric

Fabric type: 100% Polyester

Seam Sealing

Fully seam-taped

Fully taped seams

Warranty

Black Diamond warranty

Rab Product Guarantee

Packed Size

Packable

Not self-stowing

Layer Count

2.5-layer

2.5-layer

Waistband Type

Elastic waistband with drawcord

Closure type: Drawstring

Articulated Knees

Yes

Yes

Pocket Count

2

0

30000 Mm

Not applicable - no separate 30,000 mm rating field

Not applicable - no separate 30,000 mm rating field

Gore-Tex Infinium

No

No

Waterproofing

Black Diamond StormLine Stretch Rain Pants

3.9/ 5.0

Rab Downpour Eco Pants

4.7/ 5.0

Waterproofing is crucial for rain pants as it ensures you stay dry in wet conditions, which is essential for comfort and safety on the trail. The Rab Downpour Eco Pants excel in this category with a higher hydrostatic head of 20,000 mm and a Pertex Shield fabric that provides exceptional waterproofing. Buyers consistently praise its ability to keep them dry in harsh conditions. The Black Diamond StormLine Stretch Rain Pants, while still effective with a hydrostatic head of 10,000 mm and BD.dry technology, do not match the level of waterproofing provided by the Rab pants. For those who prioritize staying dry in heavy rain, the Rab Downpour Eco Pants are the clear winner.

Breathability

Black Diamond StormLine Stretch Rain Pants

3.0/ 5.0

Rab Downpour Eco Pants

4.7/ 5.0

Breathability is important to prevent overheating and discomfort during high-intensity hikes. The Rab Downpour Eco Pants again outperform the Black Diamond StormLine Stretch Rain Pants in this category. With a three-layer membrane and zippered vents, the Rab pants allow moisture to escape efficiently, keeping you comfortable during active hikes. The Black Diamond pants, while breathable, struggle to effectively cool off and have mixed reviews on their breathability. If you need pants that can handle both rain and intense physical activity, the Rab Downpour Eco Pants are the better choice.

Durability

Black Diamond StormLine Stretch Rain Pants

4.6/ 5.0

Rab Downpour Eco Pants

4.2/ 5.0

Durability ensures that your rain pants can withstand the rigors of the trail, including abrasion from rocks and brush. The Black Diamond StormLine Stretch Rain Pants shine in this category with a fabric that is tougher and more tear-resistant. Buyers note that these pants show zero signs of wear even after extensive use. The Rab Downpour Eco Pants, while durable, are not as indestructible as the Black Diamond pants and may not hold up as well in rough terrain. For those who need pants that can handle abrasive conditions, the Black Diamond StormLine Stretch Rain Pants are the superior option.

Comfort

Black Diamond StormLine Stretch Rain Pants

4.3/ 5.0

Rab Downpour Eco Pants

4.7/ 5.0

Comfort is key for long hikes, as it affects your overall enjoyment and performance on the trail. The Rab Downpour Eco Pants offer excellent comfort with articulated knees, a gusseted crotch, and an elasticated waist, providing unrestricted movement and all-day wearability. The Black Diamond StormLine Stretch Rain Pants also offer good comfort with a two-way stretch outer fabric and full knee articulation, but they do not match the level of comfort provided by the Rab pants. For those who prioritize comfort on long hikes, the Rab Downpour Eco Pants are the better choice.

Packability

Black Diamond StormLine Stretch Rain Pants

4.1/ 5.0

Rab Downpour Eco Pants

4.6/ 5.0

Packability is important for those who need to carry their rain pants in a backpack and want to save space. The Rab Downpour Eco Pants are lightweight and compact, making them easy to pack and carry. The Black Diamond StormLine Stretch Rain Pants are also packable but do not pack down as small as the Rab pants. For those who need pants that are easy to stow and carry, the Rab Downpour Eco Pants are the better option.

Ease Of Use

Black Diamond StormLine Stretch Rain Pants

3.9/ 5.0

Rab Downpour Eco Pants

4.8/ 5.0

Ease of use is crucial for quickly putting on or taking off your rain pants, especially in changing weather conditions. The Rab Downpour Eco Pants excel in this category with full-length side zippers and an adjustable waist, making it effortless to pull on over boots or layers. The Black Diamond StormLine Stretch Rain Pants, while easy to use, do not offer the same level of convenience as the Rab pants. For those who need pants that are easy to put on and take off quickly, the Rab Downpour Eco Pants are the clear winner.

Trust & Transparency

  • Data-driven rankings from real user reviews
  • Affiliate partnerships don't influence our methodology

We may earn commission from links.

Conclusion & Final Verdict:

In conclusion, the Rab Downpour Eco Pants are the better choice for most hikers due to their superior waterproofing, breathability, comfort, packability, and ease of use. They are ideal for long hikes in wet conditions where staying dry and comfortable is a priority. However, if you need rain pants that can withstand rough and abrasive terrain, the Black Diamond StormLine Stretch Rain Pants offer superior durability and may be the better option for more rugged adventures.

See All Comparisons

Related Comparisons