Custom Sizing Available
Ultrasonic Muscovy Down™
1 lb. 8 oz.Pack-Down™ Puffer Jacket
NOTE: *At launch, all non-Custom Size items will ship Mid-April. Custom Size items ship later this fall.*
The Pack-Down™ Puffer is a versatile jacket you'll reach for all season. Wear it as an outer layer on cool fall days, or as a warm and lightweight mid-layer when the temperature drops. Body-mapped, 750-fill treated Ultrasonic Muscovy Down™ delivers exceptional warmth without bulk, while the interlock bonded polyester shell is windproof, water-repellent, and durable. Whether worn daily or packed just in case, it's a piece you will want nearly every day of the season.
Pack-Down™ Puffer Jacket
Insulation
Temperature
Shell Fabric
Weight
Why We Made It
Custom Order FAQs
When purchasing a Custom size item, you'll be prompted to pay an initial deposit at checkout with the full balance due upon shipment. After placing an order, you'll be sent emails prompting you to submit a body scan with your custom measurements, along with responses to a fit survey to determine your preferences.
You’ll receive a separate email with the fit survey within minutes of placing your Custom order. If you don’t see it, check spam or let us know and we can resend it.
We don’t display measurements to customers because fit is more than numbers. Our team uses the data internally to ensure consistency and the intended fit.
Not always. After reviewing your scan and fit survey, we may determine a Standard size will give you the best result. If that happens, we’ll contact you before moving forward and apply your deposit toward the Standard item.
Custom orders involve review and a vendor lead time. The deposit holds your place; we collect the remaining balance when the shipment reaches our warehouse in late August, before we ship to you.
Once our Custom item order window closes, we'll place an order from our Vendor, targeting arrival in late August. We’ll bill the remaining balance at that time and ship once it’s paid.
Orders for Standard sizes placed in March (our launch) will begin shipping mid-April, once inventory is available.
After that, we ship on our normal in-stock schedule. Mixed orders with Standard and Custom items will ship independently according to their own availability.
We can’t clear your order for shipment without them. We’ll send reminders, and if we don’t hear back, customer service will reach out to discuss options.
The Science of Staying Warm
Human temperature regulation follows the core–shell model, where the body prioritizes keeping the core (head and torso) warm while allowing the extremities, the shell, to cool if necessary.
In cold environments, the brain rapidly reduces blood flow to the hands and feet through peripheral vasoconstriction to conserve heat for survival. This is why fingers and toes are especially vulnerable to getting cold.
Cold extremities are usually the result of insufficient insulation across the rest of the body, not just exposure at the hands or feet.
If the torso, arms, and legs are losing heat, the body further restricts blood flow to the shell, making even the warmest gloves and boots ineffective.
By contrast, when the entire body, especially the core, is well insulated, overall heat loss drops and warm blood continues to circulate to the extremities. This preserves dexterity, strength, and performance in the cold.
In practical terms, warm hands and feet start with full-body insulation. The body functions as a single thermal system, not isolated parts. To keep the extremities working, the whole body must be protected.
