Works well as a break jacket (is roomy enough) and as a normal down jacket. I pinched one star because I would have been fine with an L-sized jacket, but it tightened my chest, so I had to choose an XL.
Verified buyerMATTI R.

The new Jack Wolfskin Helium High is a minimalist, ultra-lightweight down jacket (just 450 g in size M) that can be stuffed into its own side pocket, so you’ll find room for it in the most crammed rucksack.
The shell fabric is windproof, water resistant and light weight. It allows the high performance down fill sufficient room to achieve its full loft and insulation performance.
The down used in this jacket has a fill power of 700 and is RDS certified.
bluesign product: made in accordance with the requirements of sustainable production.