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. Flat seam construction is perfect for layering and delivers a clean, athletic look. Naturally temperature-regulating and odor resistant. NEVER SETTLE™.