The Forty Below® Purple Haze overboot


Available in stock

Quick Overview

A favorite insulated boot cover choice for use on Denali, Himalayas, and Polar expeditions.  Fits Double shelled mountaineering boots.  Please see below for more details.

To Order: Please provide details about your boots and crampons in the boxes below. We will select the proper size of overboot for you based on your boot information. The crampon information is to be able to pass on any special fitting notes if needed.

1st Color Choice *

2nd Color Choice *

Your Boot Details

Crampon Binding Style


Key Features:
Easy and fast to put on in the cold and at high altitude.
Fits over double shelled mountaineering boots, and large volume single mountaineering boots.
Completely stretchy to fit a wide range of boot models.
Fit with a wide range of crampons styles.
Easy to repair.

A favorite overboot for decades by climbers worldwide, this insulated boot cover has been a top choice for use on Denali, Himalayas, and Polar expeditions.  It is a knee height, fully insulated overboot for mountaineering, and is patterned to fit over double plastic mountaineering boots.  It is a very unique overboot in that it can stretch to fit easily over a wide range of double shelled mountain boot models, and also the large volume “combi-boots” such as those from Millet, La Sportiva, etc. They also fit nicely over large volume single mountaineering boots such as the La Sportiva Nepal for example.

The Forty Below® Purple Haze™ is easy to put on in the cold, and fits trim to the boots and leg area.


Crampon Compatibility:

Double Boot:

Purple Haze With Strap On Binding
Strap on binding.

Purple Haze With Strap Toe Flip Lever Heel Binding
Strap toe/Flip lever heel binding.

Purple Haze with wire toe bail binding
Wire toe bail binding.

Single Boots:

Purple Haze With Strap On Binding
Strap on binding.

Purple Haze With Strap Toe Flip Lever Heel Binding
Strap toe/Flip lever heel binding.

Please see specifications and features on the Product Specs Tab.

Please click here to read the PDF document comparing the Forty Below® Purple Haze™ and Forty Below® K2 Superlight™ overboots: Compare PH and K2 2014

Check out this video of Ed Viesturs about the Purple Haze:

Special thanks to Ed Viesturs and Whittaker Mountaineering for using our gear and producing this video,
and letting us share it with you!

Copyright ©2019 Forty Below, Ltd

Product Photo Gallery:
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The Forty Below® Purple Haze™ model overboot is a completely insulated overboot for mountaineering boots, primarily double-shelled plastic boot styles.

It is knee height, and completely insulated using a special nylon covered, 4.7 mm stretchy neoprene closed cell foam insulation, with 2 layers of heat reflecting Titanium between the foamand the nylon.  The insulation goes completely around and under the boot, with no gaps in the insulation.  The insulation panels are glued together, and also stitched on the inside and outside surface, with no sewn through seams.  They fit trim to the boot, and are not bulky.

They fit with a wide range of crampon binding styles such as “step-in”, “new-matic”, and  “strap-on” crampon bindings.  The toe and heel area have small triangular shape panels made of a slightly thinner neoprene insulation that allows for many wire toe bails and flip lever heels to simply compress the insulation and rest on the toe and heel groove of the boot.  The toe, heel, and lower side area of the overboots have a thin rubber paint applied to add abrasion resistance and help protect the stitching.

The closure is in the front using a large size YKK® HEAVY DUTY zipper, with a flap underneath to help keep snow out.

Forty Below® overboots are very easy to repair and maintain.  The common crampon poke holes are easily glued back together.  Please see the info sheet provided with the overboots,and also the Repair Section of this website for more details.   

ORDERING: Please use the fill-in boxes above to provide information about your boot and we will select the proper size overboots for your boots.   We need your boot Brand, Model, Size, and a measurement of the bottom of the sole from the heel to the toe.  Meaure using either inches or cm.

Built in the USA!  Handcrafted in the USA. We use materials from the USA and our friends from other Countries around the world.

OVERBOOT SIZING: Forty Below® Overboots are made with stretchy insulation materials, and have a wide range of different sizes and shapes of boots that a particular overboot model/size can fit.  Because of this wide range, we ask that you provide some basic information about your boot and crampon, and then we will select the proper size with that information for you.  Please use the fill-in boxes above for ordering.

SIZING: XS-XL To fit from ladies 4 to mens 16 double shelled mountaineering boots.

COLORS: Black.  Color status 4-25-19: Red and Purple sold out until July 2019.

WEIGHT:  1lb 8 oz. (672g) per pair size Medium.

Additional information

Weight 1.25 lbs