Furano Fleece (90% Polyester / 10% Elastane) – Flylow's proprietary Furano Fleece, by Intuitive, looks all comfy and soft, but it's way tougher than your average teddy bear. It's got a smooth-faced surface that blocks wind and a grid backing that adds warmth. Because it's coated in a PFC-free Durable Water Repellent, you can wear it on its own as an exterior layer or layer it under a shell for extra insulation.

Pertex® Quantum (100% Polyamide) – What good is down insulation inside a jacket if the exterior fabric isn't doing anything in support? Pertex Quantum is like the insulation's maid of honor—it's there to make sure all the pieces fall into place. This tightly woven exterior fabric, constructed from fine yarns, has a light, soft feel that allows the insulation to fully loft. It traps still air to improve the warmth and efficiency of the insulating layer, and it's coated with a PFC-free DWR to dispel wind, rain, and snow.

40g Greenloft Recycled Insulation

PFAS-Free DWR – That's a lot of acronyms. Here's the breakdown: PFAS chemicals, or perfluorocarbons, are found in chemicals often used in Durable Water Repellent (DWR), a treatment commonly applied to outdoor gear to help the fabric shed and repel water. Once released into the environment, those chemicals are no good: They've been found to persist and distribute throughout water, snow, ice, soil, plants, animals (and yes, even in you), so Flylow has eliminated them from their products entirely.

Gridded Fleece with Strategically Placed Insulated Panels in Upper Thighs

Open Hand Pockets

Side Seam Pockets Fit a Phone

Stretch Waistband with Drawstring