but is breathable enough for comfort on ascents

2mm and 30

100g PrimaLoft® Gold Insulation (outperforms down insulation when wet + animal-friendly)

mapped with lighter panels under the arms

Icebreaker 260 Zone Ladies Leggings 2020 rx80 but is breathable enough forHeavyweight womens merino wool baselayer bottoms for highly aerobic days in cold weather, the 260 Zone Leggings features zoned ventilation panels for active temperature regulation and ample breathability. LYCRA content for stretch and mobility, Zoned body mapping technology for optimal thermal regulation, Icebreaker branded brushed elastic waistband, Strategically placed merino mesh for ventilation, Flatlock seams prevent chafing, Gusset for comfort