The Forty Below Purple Haze overboot is a favorite insulated boot cover choice for use on Denali, Himalayas and Polar expeditions. It fits Double Shelled mountaineering boots and single mountaineering boots. 

Key Features:
Full length insulated boot cover.
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.

Crampon Compatibility:  Forty Below® overboots fit with a very wide range of crampon and boot combinations.  

Size  Boot Sole Length:

XS                           10-11"

Small                  10.75-12"

Medium           11.5-12.75"

Large               12.25-13.5"

XL                           13-15"