Warm as a fleece, packable as a soda can, and never puffs out after washing.
Why Not Just Buy the Cheap One?
Cheap puffer jackets like Uniqlo Ultra Light Down or Eddie Bauer CirrusLite lose loft in a season, start leaking feathers, and turn into flat pancakes after one wash. The Nano Puff uses 60g PrimaLoft Gold synthetic insulation that stays warm even when wet and retains its shape for years. It's sewn through so the baffles don't migrate.
The Buy-Once Math
You'll buy two $80 down jackets over four years ($160) that leave you cold once damp and look like a deflated balloon. The Nano Puff costs $249 but works for a decade plus, and Patagonia will repair it for free. Don't pay twice for warmth that quits on you.