Insulated jackets come in a range of different weights, and I own a lot of them. I have light PrimaLoft midlayers that pack down into their own pockets. I’ve got burly goose feather parkas that I reserve only for the coldest days. Then there’s everything in between, from insulated vests to waterproof down ski jackets and midweight insulated hoodies.
I’d put the Mammut Sender IN jacket ($260) in a class of its own, though. Not just because the sustainable insulation material is very warm (which it is) but because this 100% recycled jacket is simply denser than all my other puffy jackets. The Sender IN uses a type of insulation I’ve never seen or heard of before.
The fill inside this puffy, called LOOPINSULATION, is made from scraps of recycled climbing rope.

Recycled synthetic insulation is growing in popularity around the outdoor retail space, but LOOPINSULATION is an altogether new take. It’s also a novel selling point for Mammut in what is increasingly an oversaturated market.
I got my hands on a Sender IN jacket as Colorado’s weather was starting to get cold. It’s been on numerous hikes with me, a late-season camping trip to the desert, dog walks, nights around town, and to the base of ski areas, where it kept me warm while I changed clothes.
Through it all, the LOOPINSULATION continued to surprise me. I don’t like packing it or carrying it if I’m not wearing it. But warmth-wise, this jacket is a winner.
In short: Mammut takes the circular economy to the next pitch with the Sender IN hooded jacket. The insulation comprises recycled climbing rope scraps, and the outer material is 100% recycled polyester. It’s windproof and water-resistant with a PFC-free DWR coating. It also has a two-way stretch for ease of movement. This is a great jacket for everyday use, though I’d be reluctant to take it on any adventure where weight and packability are priorities.
- Weight: 696 g
- Outer material: Recycled polyester
- Insultion: LOOPINSULATION from recycled rope scraps
- Fill weight: 330 g
- Cut: Regular fit
Pros
- Very warm for cold days
- 100% recycled
- Insulation made from recycled climbing ropes
- Stretch makes movement easy
Cons
- Heavier than normal insulation materials
- Not very packable
- Left handed zipper
Mammut Sender IN Hooded Jacket Review

Warmth & Weather Protection

Packability

Weight
Zipper

Mammut Sender IN: Who Is It For?
