Building the System: Base, Mid, and Wind Shell
Choose wicking fabrics that pull moisture from the skin—synthetic knits or merino blends excel here. Grid constructions improve airflow and dry times, keeping you comfortable when a blasting headwind meets a steep climb and your effort spikes without warning.
Building the System: Base, Mid, and Wind Shell
Lofted fleece, breathable active insulation, or merino mid‑weights create pockets of warm air without smothering you. Prioritize pieces that breathe well under a shell, maintaining warmth during rest stops yet dumping heat as soon as you start moving again.