SKU: 98223880843

Neutrino 400 Wide

Sale price$102.38 Regular price$113.75
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Ships within 48 hours · Estimated delivery Jul 19 - Jul 24

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Description

Neutrino 400 WideFor the alpinist looking for a lightweight, low bulk bag suitable for cold temperatures, the Neutrino 400 offers exceptional packability and warmth for its weight. Designed with a narrow mummy fit, for reduced bulk and pack size, and constructed with lightweight, high performance materials. Its perfect for three season mountain missions. The Neutrino 400 is filled with 400g of 800FP, goose down, stabilized in chevron shaped baffles, cleverly designed

For the alpinist looking for a lightweight, low bulk bag suitable for cold temperatures, the Neutrino 400 offers exceptional packability and warmth for its weight. Designed with a narrow mummy fit, for reduced bulk and pack size, and constructed with lightweight, high performance materials. It’s perfect for three season mountain missions. The Neutrino 400 is filled with 400g of 800FP, goose down, stabilized in chevron shaped baffles, cleverly designed to reduce the amount of fabric needed compared to traditional horizontal baffles. The trapezoid boxwall baffle construction allows the down to fully loft, eliminates cold spots, and maximizes warmth. Additional baffles along the length of the zip and around the neck decrease heat loss, and with an adjustable drawcord around the hood you can cinch the bag around your face. Now built with a recycled nylon lining and recycled Pertex® Quantum outer, it’s wind resistant and a little lighter on the planet too. The down is also finished with a Nikwax, fluorocarbon-free hydrophobic treatment for coping with condensation.

  • Weight saving chevron baffle design, reduces down migration and optimizes core warmth.
  • Trapezoidal boxwall construction with differential cut, to maximize loft and warmth
  • Close fitting adjustable neck baffle design for decreased heat loss
  • YKK 3/4 length main zip with synthetic filled baffle to trap warmth
  • YKK zipped internal stash pocket
  • Angled foot box for relaxed sleeping posture
  • YKK Anti-snag zip insert and anti snag internal zip guard
  • Hand-filled in Derbyshire UK
  • Zipped cotton sack with water-resistant base for home storage
  • Waterproof roll-top compression sack included
  • 800FP European Goose Down with Nikwax Fluorocarbon-Free Hydrophobic Finish (400g / 14.1oz)
  • Main: 100% recycled polyamide - 20D Pertex® Quantum recycled nylon ripstop (38gsm) with fluorocarbon-free DWR
  • Lining: 100% recycled polyamide - 20D Recycled Nylon (38gsm)
  • Sleep Limit: 20°F (-7°C)
  • Sleep Comfort: 30°F (-1°C)
  • Sleeping Bag Length: 84.6 in
  • Max User Height: 6' 1" (72.8 in)
  • Internal Shoulder Girth: 70.9 in
  • Internal Hip Girth: 57.5 in
  • Internal Foot Girth: 43.3 in
  • Pack Size: 13.8 in x 9.1 in
  • Weight: 1 lb 14 oz (29.5 oz)
Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 98223880843

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4.5 ★★★★★
Based on 26 reviews
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Product Reviews
K
Verified Purchase
K. Davis
Louisville, US
★★★★★ 5
Works for foot psoraisis
Size: 2 pairs black L
Got these for work (service industry) to reduce issues with psoriasis and blisters while putting on 20k+ steps a day. Over time the wounds healed and I could work without so much pain. I now don't use them all the time like I used to, only when a new lesion or blister appears, too prevent a breakout. Tip: if you're not in full breakout, wear thick socks under these as a barrier to friction.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 28, 2026
K
Verified Purchase
Kim C
Battle Creek, US
★★★★★ 4
Work well but run small
Size: 1 pair black L
They do seem to run a bit small. I bought them for my bf but snagged them from him because I couldn’t resist! I’m about a W8/12 and they were just a little big but unlike others, I just put them on while sleeping and didn’t walk around with them. If you’re just planning on that, they did a great job at sloughing and moisturizing 😎
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 25, 2026
A
Verified Purchase
Aaron Duncan
Dallas, US
★★★★★ 5
Good socks they work.
Size: 2 pairs black L
I normally wear size 13&half to 14 men's, and these fit me ok. They sit just below the ankle. They can get a little tight for me so you should look out for that if you are on the thicker side. But they work as advertised and help moisturize your feet. I recommend wearing them if you're going to just be hanging around home for a bit in one spot as they can be a little slippery to walk in if you go fast. Would not recommend going up and down stairs.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on August 28, 2025
B
Verified Purchase
Brian
Alexandria, US
★★★★★ 5
Good socks
Size: 1 pair black L
Good socks
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Reviewed in the United States on May 6, 2026
A
Verified Purchase
Amazon Customer
Cuba, US
★★★★★ 3
REALLY unsafe to walk around in these
Size: 2 pairs black L
They do what they are expected to do, but should only be used if you are stationary. The gel base makes for very unstable footing if walking around
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 27, 2026

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