Millet Semnoz Insulation JacketAn insulated waterproof at 526 g and 27,500 yen

On a winter low mountain or in town after the hike, are you torn between carrying a rain shell and a warm layer, or getting by with one? Millet's Semnoz Insulation Jacket is a new model that puts thin insulation inside a 2-layer waterproof-breathable fabric, at 27,500 yen (tax included) and 526 g (men's M). The Millet official online store listed it as new on Nov 10, 2026. If you want one jacket for low mountains from late autumn into winter, and for walking straight into town afterward, it is a buy. For snowy mountains or days with long, sweaty climbs, a separate rain shell and warm layer suit you better. The numbers are the maker's published figures and my own calculations.

【Listed as new by Millet on 11/10/2026】Millet Semnoz Insulation Jacket: An insulated waterproof at 526 g and 27,500 yen

The Semnoz Insulation Jacket combines a rain shell and a light warm layer in 1 jacket. Its strength is 52.3 yen per gram

Here is the answer first. This is a jacket with thin insulation inside a 2-layer waterproof-breathable fabric (Dry Edge Mechanical Stretch 2L). It weighs 526 g in men's M and costs 27,500 yen (tax included). Price divided by weight is 52.3 yen per gram, the cheapest among Millet and the 3 other options compared in this article.

The Millet official online store listed it as new on 11/10/2026. Semnoz is the 2026 autumn-winter series that Millet's 10/7 press release described as "seamlessly connecting the field and the city."

Buying from outside Japan? Sign up free for Rakuten Global Express (Rakuten's official forwarding service) and check out with its Japan warehouse address → full guide

What this article covers

• Official numbers (weight, materials, construction) and the price per gram
• The difference from Millet's own Typhon Warm Jacket (22 g and 12,100 yen)
• The difference versus splitting into 2 pieces, a rain shell and a warm layer (54 g and 34,100 yen)
• For hiking, what kind of day it suits

Semnoz Insulation Jacket weight and official numbers

Sizes are in European sizing, and Millet states "S = Japanese M." If you usually wear a Japanese M, starting from S saves guesswork. The women's version (MIV03261) is also 27,500 yen.

Versus other "waterproof + warm" options: how much and how many grams apart?

On a winter low mountain, you can handle rain and cold either with one jacket or by splitting it into two pieces. I lined up 3 jackets and the two-piece option.

I can say this firmly. The Semnoz is the cheapest of the options compared, and 54 g lighter than splitting into two pieces. 526 g − 504 g = 22 g and 39,600 yen − 27,500 yen = 12,100 yen, so it is only slightly heavier than the Typhon Warm yet over 10,000 yen cheaper. Versus two pieces, the gap is 580 g − 526 g = 54 g and 61,600 yen − 27,500 yen = 34,100 yen.

Still, there is one point the numbers alone should not decide. The Typhon Warm is built as mountain rainwear and publishes a 30,000 mm waterproof rating. The Semnoz product page only says "waterproof-breathable" and gives no rating. If you will walk for long hours in heavy rain, the safer side is to choose the one that publishes its numbers.

The difference from the Typhon Warm is whether it has insulation

Both are Millet "warm waterproof jackets," but the idea behind them differs. The Typhon Warm adds warmth by brushing the inside of the waterproof fabric, and lists no insulation. The Semnoz is clearly insulated, with 60G/40G listed.

I split them this way: the Typhon Warm for rainy hiking days with long walking, the Semnoz for days with long stops or walking in town. I covered its numbers and build in my Typhon Warm Jacket review.

Buying from outside Japan? Sign up free for Rakuten Global Express (Rakuten's official forwarding service) and check out with its Japan warehouse address → full guide

For hiking, what kind of day does it suit?

Millet describes this jacket as an insulated waterproof-breathable jacket with outdoor features that also works for city walks in the cold months. It gives no guide to how cold it can handle in the mountains.

These are the days I think it suits:

• Low mountains from late autumn into winter, on days with long stops for breaks or views
• Days with cold rain in the forecast, when you do not want to take a rain shell and a warm layer in and out separately
• Days you stop by a train or hot spring after the hike and want to keep wearing it in town

On the other hand, on days with long, sweaty climbs, not being able to take off the insulation is its weak point. There is no mention of underarm zips; you vent by opening the two-way front zip from the bottom. It is not a jacket for snowy mountains. For winter mountain gear, decide separately based on the mountain and season.

For layering underneath, see my hiking layering article; to compare warm layers alone, see my hiking down jacket ranking.

Pairing it with the Semnoz pants as a set

The Semnoz Ripstop Pants from the same series are brushed-lining pants at 402 g (M) and 16,500 yen. 526 g + 402 g = 928 g and 27,500 yen + 16,500 yen = 44,000 yen. The pants are water-repellent, not waterproof. On rainy days, carry separate rain pants for your legs.

Buying from outside Japan? Sign up free for Rakuten Global Express (Rakuten's official forwarding service) and check out with its Japan warehouse address → full guide

How to choose the Semnoz Insulation Jacket, and my verdict

1. Price: 52.3 yen per gram. If you want 1 warm waterproof jacket for under 30,000 yen, start here.
2. When to wear it: days with long stops, and days you walk straight into town. On days with long, sweaty climbs, two pieces are easier.
3. Numbers: no waterproof rating is published. If you will walk for long hours in heavy rain, choose the Typhon Warm, which publishes 30,000 mm.

Verdict: If you want to handle winter low mountains and town with one jacket instead of a rain shell plus a warm layer, the 27,500-yen Semnoz Insulation Jacket is a buy. If you sweat on climbs or often hike in heavy rain, go with the Typhon Warm or two separate pieces.

To compare it with lighter rain shells from other brands, see my hiking rain jacket ranking, which lists weights and prices.

About the writer and sources

I hike in Japan and abroad, and I'm a gear nerd who collects gear.

Published 2026-11-10 / Updated 2026-11-10. I checked the numbers on 2026/11/10. The source for each number is listed right below the table it appears in.

FAQ

How much does the Semnoz Insulation Jacket weigh?

526 g in men's size M (Millet's official listing).

How much does the Semnoz Insulation Jacket cost?

27,500 yen (tax included). Men's and women's are the same price.

Is it waterproof? What is the waterproof rating?

It uses a 2-layer waterproof-breathable fabric with all seams taped. The product page does not list waterproof or breathability numbers.

Should I choose this or the Typhon Warm?

For rainy days with long, sweaty climbs, the Typhon Warm (504 g, 39,600 yen, 30,000 mm waterproof rating). For days with long stops or days you also wear it in town, the Semnoz (526 g, 27,500 yen). The difference is 22 g and 12,100 yen.

How does it fit? I usually wear a Japanese M.

Sizes are in European sizing, and Millet states "S = Japanese M." If you wear a Japanese M, start with S. The cut is a relaxed fit with a slightly short length.

Can I use them on snowy mountains?

Millet describes it only as an insulated waterproof-breathable jacket with outdoor features that also works for city walks in the cold months. It is not described as being for snowy mountains, so I do not recommend it as snow mountain gear.

Gear in this article

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Millet Semnoz Insulation JacketMillet Typhon Warm JacketMillet Semnoz Ripstop Pants (men's)

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