The Patagonia Isthmus Deck Jacket is cut for the in-between days, cool enough for insulation and mild enough that a parka would be overkill. The regular fit and hip length work equally well as a standalone layer on a cool afternoon or tucked under a heavier shell when the temperature keeps dropping. The DWR finish is made without intentionally added PFAS, so the jacket handles light weather without the chemistry trade-offs. What Our Gearhead(R) Experts Are Saying:"I grab this when the temperature drops enough to need a layer but not enough to justify a full parka. The 60-gram Thermogreen insulation keeps the bulk down so it fits under a heavier shell when the day turns."