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Black Diamond Coefficient Storm Hoody Review

black diamond coefficient storm hoody
  • Thermal comfort
  • Breathability
  • Wind protection
  • Freedom of movement
  • Weight and dimensions
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Mid-layer or softshell? A little bit of both for this warm, lightweight and wind-resistant, as well as water-repellent, mid-layer. The hood and three pockets (plus the two inside ones) make it very comfortable to use with a really small overall bulk when closed. Usable for different activities throughout the year.


  • Water repellency
  • Lightness
  • Wind and abrasion resistance
  • Elasticity of the fabric


  • Limited breathability with respect to heat

Black Diamond Coefficient Storm Hoody is the technical microfleece for use as a midlayer during mountaineering, ski mountaineering and climbing outings in cold-weather environments.

The Polyester Stretch Grid Back Woven fleece construction with grid interior provides good heat distribution, although it tends to trap some moisture in the armpit area while drying quickly. The outer fabric is lightweight and wind- and abrasion-resistant, as well as water-repellent.

Black Diamond Coefficient Storm Hoody on snow

Technical features of the Black Diamond Coefficient Storm Hoody

  • Cut: regular
  • PFC-free DWR treatment for water repellency
  • Polyester Stretch Grid Back Woven Fleece fabric with grid interior
  • Weight: 295 g
  • One chest pocket and two hip pockets
  • Manufacturer link
black diamond midlayer on climbing test

The garment is constructed from Bluesign-approved materials that are closely monitored throughout the production chain to ensure their sustainability with regard to people, the environment and resources. The DWR treatment is PFC-free.

Test mode

I tested the Black Diamond Coefficient Storm Hoody during several ski mountaineering trips and a few climbing trips on multipitch routes in April 2024, on sunny and warm days but also during intense snowfalls with temperatures well below freezing, up to 3400 meters above sea level.

ski mountaineering with black diamond coefficient storm hoody

Black Diamond Coefficient Storm Hoody on-site test

Design and construction

This garment has a regular fit, and is specifically designated for the female body, on which it molds without leaving excess fabric. In addition, the fitted design allows it to be worn under an additional layer if temperatures are particularly cold, as was often the case during the test days. Finally, the sweatshirt folds inside the ventral pocket, taking up very little space in the backpack.

fitting the bd hoody

Thermal insulation and breathability

The Black Diamond Coefficient Storm Hoody is a warm mid-layer, entirely suitable for use during the winter period, in even cold temperatures. The construction with a grid interior is functional in improving moisture transport characteristics; however, during testing I found breathability characteristics that could be improved, especially when, as we proceeded through the day, temperatures rose. When climbing under stress, sweat tends to be trapped in the armpit area, especially when wearing an additional layer, such as a shell, over it. However, the full zipper facilitates thermoregulation, allowing you to lighten up when needed. Drying is very quick, however.

inside fabric of bd midlayer
Fabric detail

Wind and water protection

Although the Coefficient Storm Hoody is a midlayer, to which you would therefore not require wind-protection features, it has excellent windproof performance thanks to an outer membrane that also adds abrasion resistance. As for water protection, the garment consists of a DWR treatment that imparts water repellency: in rainy or light snowy conditions, water droplets tend to stop on the fabric without being absorbed. This makes it suitable for use even without anything on top.

Features of the Black Diamond Coefficient Storm Hoody

This model has one chest pocket, two very large pockets at belly height with zippers, and two internal mesh pockets.

Internal pockets

I find this abundance of pockets extremely convenient; midlayers often have only one on the chest, which hinders practicality in use. In addition, the Coefficient Storm Hoody has a hood, which is very convenient for sheltering the head when the wind suddenly picks up, and very easy to fit under a helmet. Finally, the high neck protects from the cold all the way down to the chin. Overall, the stretchy fabric leaves good freedom of movement.

the hood of the black diamond coefficient storm hoody

Durability and odor resistance

The fabric of which this garment is made is externally very resistant to abrasion. After about ten outings of use, however, I noticed that near the sleeve hems and along the bottom of the zipper the fabric has formed a number of ‘dots’ which however do not compromise its durability, they are just a bit unsightly.

detail of the external fabric

In terms of odor resistance, the hoodie performs above average: in ten outings it only needed to be washed a couple of times.

Weight and dimension of the Black Diamond Coefficient Storm Hoody

The Black Diamond Coefficient Storm Hoody has a really low weight (295 g for the women’s model), and interesting compressibility features: it is indeed possible to store it in the inside pocket, so that it takes up little space in the backpack and helps to keep it tidy (for yours truly, something not to be taken for granted).

dimensions of the midlayer when closed


The fit is regular: I got an M, the size I usually wear for knitwear, and the garment fits perfectly without being tight or overly loose.

fit of the black diamond coefficient storm hoody

Recommended for

The Black Diamond Coefficient Storm Hoody is an excellent midlayer for activities such as ski mountaineering and climbing long alpine routes in the environment. Water repellency and wind protection features, as well as light weight and warming power, are the strengths of this garment, suitable for the winter season or higher altitudes.

In addition, this midlayer allows great freedom of movement and is specifically designed for the female body, shaping very well on the hips without leaving excess fabric. It is suitable for those looking for a garment to use as a midlayer under a shell, but also to use as a last layer when the sun comes out. In short, a thermal garment that also stands up well as a last layer when you need to be sheltered from the wind.

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