trekking during wintertime

active adventures alpine altitude ascend backcountry backpacking benefits black boots challenge climb climbers cold compact dangerous discover ecosystem energy equipment europe experience explore extreme favorite fog footpath footprint friends glacier healthy hiking ice journey lightweight map marks member mist mountain mountaineer mountains nature off outdoor outside park partners path peak people poles portable recreational risks route salvamont snow snowfall sport sunlight team top tour tourism track trail training travel trekking treks trip walking weather weight white winter worldwide