Based on this product's specifications, here are some alternatives and similar models
Icebreaker 260 Tech Leggings with Fly Thermal Base Layer, Black, Size M
Summary description:
The Icebreaker 260 Tech Leggings with Fly are high-performance thermal base layer bottoms designed for cold weather activities. Made from 100% merino wool, these leggings provide natural warmth, breathability, and odor resistance. Featuring a functional fly and flatlock seams to prevent chafing, they are ideal for skiing, mountaineering, or winter hiking, ensuring comfort and temperature regulation in demanding conditions.