Layered up or worn alone, the INVIGORATR^™ is built for adventure. 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. Our flat seam fabrication is perfect for layering and delivers a clean, athletic look. Naturally temperature-regulating and odor-resistant. NEVER SETTLE^™