Note: this is Burton’s Slim Fit Small, so basically a normal Small from a Patagonia. Very good condition with minimal wear and from a smoke free home. Fabric is breathable and stretchy but warm due to the down. A great layering piece and pretty much exactly like Patagonia’s Nano Air down line. From Burton: Worth Way More Than Its Weight in Warmth The men's Burton [ak] Helium Hooded Stretch Insulated Jacket is the midweight layer that should always be on the packing list. You can wear it hiking when it's cool and windy or under your shell to stay warm on a ridge top. It's stretchy enough for an unrestricted feel and breathable enough to wear when you're headed uphill. When you don't need it, it stuffs into its own pocket and easily stows in a small pack. * Super PackableIt's so light and packable, there's no reason to leave it behind. * Full of StretchStretch nylon fabric lets you move easily without feeling restrictive. * Warmth that BreathesLow-bulk insulation adds warmth while staying breathable for hiking or skinning. * Low Environmental ImpactBluesign® approved materials reduce impact on humans and the planet during manufacturing.