40 Below Vest
New lighter weight Version
Introductory price special!!

$68.00

Available in stock

Quick Overview

The new updated 40 Below ZVB Vest™  The “zone vapor barrier” vest designed specifically for helping eliminate moisture build up in your clothing layers between you and your backpack!  No more soaking wet back in your jackets or pack!

Please see below for additional information and specifications. 

Size *

Description

September 2021: The NEW lighter weight version is now available!!

SPECIAL INTRODUCTORY PRICE $68.00!!  Regular Price $105.00 
Be part of our Beta/Demo group and get a reduced price, and help get us feedback on performance and features!  (Limited time offering)

A truly revolutionary clothing piece!  The Forty Below® 40 Below Vest is great for folks who sweat a lot and are trying to reduce moisture buildup in the insulating layers between your back and the backpack.  Designed as a “zone vapor barrier” to keep perspiration moisture from accumulating in the layers of clothing between you and your pack. 

We invented this unique vest back in the 1980’s to help keep down climbing suits, down jackets, fleece, and wool mid-layers from getting wet in the back from perspiration from sweating, between you and your backpack, while climbing in extreme cold and high altitude zones.  Once a down jacket gets wet it losses a significant amount of insulation and is very difficult to get dry, especially on long trips and expeditions.  This solves the problem that some folks have with excessive sweating, and are looking for tools to manage that moisture and help keep insulation values in those layers.

This new version of the 40 Below Zone Vapor Barrier vest now embodies the state of the art with new special lightweight materials and a dynamic fit for maximum performance and comfort.  These new elements now makes this vest capable of being used for not only high altitude and extreme cold climbing, but also performance athletes participating in cold weather events such as fat tire mountain bike races, cross country and snowshoeing races, and long distance endurance races, such as the ITT Iditarod, Arrowhead 135 Ultra, and many more around the world.

Ever take your pack off to find an excess amount of water in your back insulation, only to quickly turn to ice?  This vest will help eliminate most of this problem!

The Forty Below® ZVB Vest™  which is a vapor barrier vest clothing piece, is designed for activities in a wide range of cold weather conditions, and very specifically helpful in extreme cold conditions.  When you are done with your activity, you can take off the vest and have your outer jacket or insulation layers that are not soaked in the back area!  Your base layer will be damp as it normally is, but that is usually much easier to air dry than an insulating layer for sure!

The “back panel zone” of the vest is made of a specially made stretchy coated lightweight polyester fabric that does not allow moisture to pass through it.  It flexes with your body movement, which is perfect for comfort when wearing a backpack! The back shape is longer cut to fit under hip belts better and slightly insulate the lower back and kidneys.

The “front panel zone” is made of a stretchy thin polyester fabric that allows moisture to wick well and dry fast.   The front shape is shorter than the back to help keep out of the way of hip belts and climbing harnesses. The large arm openings allow for maximum freedom of motion and reduced restriction.  Front closure is 4 small snaps to help keep it lightweight, low profile, and maximum moisture passage.

Please also see the Specifications” tab for more details!

“…anyone who has carried a pack and sweated and soaked their insulation, which then froze or didn’t dry should realize what an advantage this radical product could be in your climbing wardrobe.  I give it a 9 on a scale of 1 to 10” Marc Twight  Rock and Ice Magazine Product Review, February 1993

SPECIFICATIONS:

The front closure are 4 small snaps, to keep the vest light and not interfere with other clothing layers.

Longer cut in the back to help insulate kidney area.

Shorter cut in the front to help stay out of the way of backpack hip belts, climbing harness, etc.

No Pockets: This helps reduce weight, reduce front bulk, plus enable as much sweat moisture vapor in the front of the vest to pass through. 

Superlight weight!!  ONLY 5 ounces for size “M/L” (medium-large)!

Packed size: Smaller than a 12 oz. beer can! (“M/L” (medium-large size) measures only 3.75″ x 2.25″ x 2.25″ !!

Color: FRONT: White body with “40 Below ZVB” graphics in Blue.    BACK: Black

Sizes:  “ZONE RANGE” SIZING: 5 sizes Each of the sizes is designed to fit a “range”, and the vest is made of stretchy materials to flex and allow for a better fit in motion and when wearing a pack.

Small/Medium (Fits folks who are usually size Small to Medium size in a base layer)
Chest Circumference: 41 inches and stretchy.

Medium/Large (Fits folks who are usually size Medium to Large size in a base layer)
Chest Circumference: 43 inches and stretchy.

Large/X-Large (Fits folks who are usually size Large to X-Large size in a base layer)
Chest Circumference: 45 inches and stretchy.

X-Large/XX-Large (Fits folks who are usually size X-Large to XX-Large size in a base layer)
Chest Circumference: 48 inches and stretchy

XX-Large/XXX-Large (Fits folks who are usually size XXL to XXL in a base layer)
Chest Circumference: 54 inches and stretchy.

2021 Forty Below Ltd

Product Photo Gallery:

 

The Forty Below Ltd Brand 40 Below Zone Vapor Barrier vest!

 

FRONT  VIEW:  This is the front view showing the breathable front panel, the shorter cut in the front fabric to help be out of the way of hip belts and climbing harness, and long back panel for more light insulation around the kidneys and larger surface area for wetness protection.  The shoulder coverage of the coated material goes over the top of the shoulder and down a couple of inches for maximum comfort under shoulder straps.

BACK VIEW:  The back view of the vest, showing the special stretchy waterproof material that helps keep moisture from your back from getting into your insulation layers.  One of the very unique features of this back panel is that it is a 4 way stretch, so it is dynamic for body movement, and comfort when wearing a backpack, allowing for full motion of the body without restriction like it would be if it was just a coated nylon rigid material.

 

The new updated 40 Below ZVB™ Vest!

This is a special unique vest that is a “zone vapor barrier” (ZVB), very helpful for people who are sweating at a rate that saturates the clothing between you and your backpack. 

The BACK ZONE: The stretchy nylon material back panel is super thin coated to prevent moisture from passing through it, and the front thin polyester 

The FRONT ZONE:  The front is a super lightweight stretchy polyester fabric that allows moisture to pass through.

The front closure are 4 small snaps, to keep the vest light and not interfere with other clothing layers.

Longer cut in the back to help insulate kidney area.

Shorter cut in the front to help stay out of the way of backpack hip belts, climbing harness, etc.

Superlight weight!!  ONLY 5 ounces for size “M/L” (medium-large)!

Packed size: Smaller than a 12 oz. beer can! (“M/L” (medium-large size) measures only 3.75″ x 2.25″ x 2.25″ !!

Color: FRONT: White body with “40 Below ZVB” graphics in Blue.    BACK: Black

Sizes:  “ZONE RANGE” SIZING: 5 sizes Each of the sizes is designed to fit a “range”, and the vest is made of stretchy materials to flex and allow for a better fit in motion and when wearing a pack.

Small/Medium (Fits folks who are usually size Small to Medium size in a base layer)
Chest Circumference: 41 inches and stretchy.  Packed size: 3.25″ x 2.25″ x 2.25″ Weight (approx) 4.5oz./126g.

Medium/Large (Fits folks who are usually size Medium to Large size in a base layer)
Chest Circumference: 43 inches and stretchy. Packed size: 3.75″ x 2.25″ x 2.25″ Weight (approx) 5.0 oz./140g.

Large/X-Large (Fits folks who are usually size Large to X-Large size in a base layer)
Chest Circumference: 45 inches and stretchy. Packed size: 4″ x 2.5″ x 2.5″ Weight (approx) 5.5oz./154g.

X-Large/XX-Large (Fits folks who are usually size X-Large to XX-Large size in a base layer)
Chest Circumference: 48 inches and stretchy. Packed size: 6″ x 2.5″ x 2.5″ Weight (approx) 6.3 oz./177g.

XX-Large/XXX-Large (Fits folks who are usually size XXL to XXL in a base layer)
Chest Circumference: 54 inches and stretchy. Packed size: 7″ x 2.5″ x 2.5″ Weight (approx) 7.1 oz./197g.

2021 Forty Below Ltd

Additional information

Weight .6 lbs