Understand the Three-Layer System
Your base layer should pull sweat away before it chills you. Lightweight merino or quick-drying synthetics reduce clamminess, reduce chafing, and improve comfort. Prioritize snug-but-not-tight fits, raglan sleeves under pack straps, and flat seams for long climbs.
Understand the Three-Layer System
A good mid layer captures warm air while breathing during steady movement. Micro-grid fleece or active insulation excels on variable terrain, reducing the need for constant stops. Keep it handy so you can fine-tune warmth at snack breaks or breezy ridgelines.