Warmer. Lighter. Stronger. The new RealFLEECE Icebreaker Men's Sierra Long Sleeve Zip has merino fibers wrapped around a nylon core, then brushed to maximize warmth and softness. With a hint of LYCRA, the Sierra fits like a charm, is built for performance and keeps out the cold when you're hiking, skiing or sightseeing. Features: Weight: 200 Lightweight Fit: Regular Lightweight, naturally odor resistant, breathable Secure zippered chest pocket with media port Internal storm flap keeps out the cold Secure zippered hand pockets Care: Machine wash. Dries fast in the shade, but do not tumble dry Note: Black & Black Black are identical colorsFabric: 86% merino wool/10% nylon/4% LYCRASee "Overview" below for sizing information.