How is the Hi-Loft different from the standard Nano Puff?

It uses more and body-mapped PrimaLoft Silver Eco insulation plus heavier 50-denier overlays on the shoulders and sleeves. That makes it warmer and more abrasion-resistant, but bulkier and less packable.

Is it warm enough for winter?

It handles cold, low-output days like belays, camp and town wear well. For sustained high-output activity it runs hot and traps moisture.

Does it stay warm when wet?

Yes. PrimaLoft Silver Eco is synthetic, so it retains much of its warmth when damp, unlike down.

No. The recycled ripstop shell is windproof and water-resistant with a DWR finish, good for light snow and drizzle but not sustained rain.

What sizes does it come in?

It comes in XS through 3XL with a regular fit and a drop-tail hem. The hood is helmet-compatible and adjustable.

How does it compare with the standard Nano Puff?

It is warmer and tougher than the standard Nano Puff, with body-mapped insulation and 50-denier overlays on the shoulders and sleeves. The trade-offs are more bulk, a larger packed size and less breathability.