What role does the elastic cuff at the ankle of the Bivouac Down Pants play?
This is a situation of choosing winter outdoor pants and checking whether cold wind will enter when wearing boots.
It flexibly wraps around the ankle to serve the role of blocking cold air from penetrating through the gap when wearing boots[1].
The function of blocking cold wind in the Bivouac Down Pants is encountered inside the hem of the pants. ostrya designed these clothes focusing on thermal insulation to protect body temperature even during outdoor activities in extreme weather[2].
In winter mountaineering or outdoor activities, high-cut winter boots are mainly worn, and cold wind can easily seep in between the footwear and the hem. The elastic cuff attached to the hem of these pants snugly wraps around the collar of the footwear, blocking outside cold air from rushing in even when boots are worn[3]. It is a structure that traps warmth inside the pants so it does not leak out, even when walking in snowfields or facing harsh winds.
Whether there is a feature to adjust the tightening of the band or the specific material composition of the ankle cuff has not yet been confirmed.