Maybe the best shell.
Designed and manufactured by the minority but super awesome Japanese outdoor label Yamatomichi.
Retail price is about USD 450 and never on sale.
Out of stock now and rarely available outside Japan.
Brand new with cards.

When hiking in snow, you need to be mindful of your layering. If you layer too much, you get too hot on the climbs. Layer too lightly, and you face getting cold during your breaks.
Down jackets provide too much insulation when moving and are way too hot on trains or in heated mountain huts, etc. With active insulation gear, you don’t need to worry about taking layers on and off because of its high insulation and breathability. However, until now, we haven’t seen a jacket that could cope with the fierce winds and blizzards of winter hiking.
Our new All-weather Alpha Jacket, combines Polartec Alpha Direct, which excels in breathability and insulation, with Pertex Shield Air, known for its outstanding breathability, waterproofing, and lightweight properties. This jacket is comfortable both while on the move or when resting indoors, and can withstand winter storms and blizzards. A true all-weather active insulation layer made for winter.
Wearing this, you won’t have to worry about layering during your winter hikes anymore.

All-weather Alpha Jacket Features

– Outer shell, Pertex Shield Air that can withstand blizzards and snow.
– High-insulating Polartec Alpha Direct lining (136g/m²).
– Comfortable during activity and indoors compared to down jackets.
– Helmet-compatible hood.
– High water repellency (C6 DWR).
– Quickly ventilate with pit zips.
– Breathable and insulating all in a single jacket.

https://www.yamatomichi.com/en/products/all-weather-alpha-jacket