When you want serious warmth and breathability, reach for the Sierra Long Sleeve Zip. A superior solution to synthetics, our RealFLEECEAR has recycled merino fiber wrapped around a Nylon core, then brushed to maximize warmth and softness. With a hint of LYCRAAR, the Sierra fits like a charm and is built for performance, keeping out the cold when you're hiking, skiing or sightseeing, but always breathable and resists odor day after day. Feel the difference and you'll be a convert. Weight: 200 Lightweight Fabric: 86% Merino wool, 10% Nylon, 4% LYCRAAR Fit: Regular Layer: Mid Layers Best for: Outdoor Hiking Benefits: Warmth, Breathability, softness Features: Icebreaker RealFLEECEAR technology, Secure zippered chest pocket with media cord port, internal storm flap, secure zippered hand pockets Care: Machine wash. Dries fast in the shade, but do not tumble dry. Exact instructions on the care label.