Yes. The Isotherm hoody or jacket is the Polartec Alpha insulation. Probably the best bet if you are looking for a synthetic puffy.
Other Marmot stuff that is awesome:
The Thermo Hoody and Thermo 1/2 zip are the PolarTec Power Dry High Efficiency fabric, same light grid fleece as the Patagonia Capilene 4. This stuff is amazing. Super warm in winter, but breathable enough to wear in cooler weather — for example as camping sleepwear in the 40s and 50s.
All of the Marmot Power Stretch fleece stuff is fantastic — gloves, beanie, hoodies, and tights. The same weight as the lightest weight fleece, but hard woven on the outside, and stretchy. Love the stuff.
Their down jackets are really nice. The Zeus jacket is a great midweight 800 fill fleece. It is my go-to jacket around town for dry winter days.
The Quasar Hoody and Jacket are awesome ultralight 900 fill down with 10 dernier Pertex shells. Perfect winter warm layer in the backpack The weight on the hoody is wrong. My men's medium is 10.9 ounces. Packs small.
The Scree pants are terrific stretchy softshell fabric. These are my winter hiking pants. The Cruz pants (and convertible pants) are terrific summer hiking/travel pants.
If you need a fancy shell, the Nabu NeoShell is super nice. Polartec NeoShell 3-layer softshell. The inner bonded layer is a very light PowerDry fabric.
And, of course, they make the usual GoreTex Pro jackets.
For rain gear, the Precip jackets and pants are one of the better standard 2.5 layer rain gear options. The Essence jacket (5.8 ounces) and pants are ultralight rain gear — perfect for the back pack.
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