Comfort and warmth begin at the base with the INVIGORATR^™ Knicker. Ultra-fine Merino yarns wrap around a tough nylon core for softness, strength, and lightweight warmth. AEROKNIT^™ construction traps heat in micro air pockets to keep you warmer without adding weight. Flat seam construction provides low-bulk layering with cozy, all-day comfort. And knicker length means you won't experience any fabric bunching in your boots. NEVER SETTLE^™