The INVIGORATR(TM) MERINO 1/4 ZIP features superfine Merino which is softer on your skin while innovative AERO(TM) KNIT construction traps micro air pockets to keep you warmer without adding weight. The articulated design and flat seam construction make it the perfect layer for cold weather activities. AERO(TM) KNIT FABRIC - A SOFTER, LIGHTER, WARMER MERINO WOOL Merino wool blend naturally regulates body temperature Keeps you dry and comfortable all-day Ultra-light and soft Naturally odor resistant A touch of nylon added for strength DIFFERENT BY DESIGN. DIFFERENT BY CONSTRUCTION.(TM) Articulated design for superior mobility and fit DYNAMIK(TM) stitching for increased stretch and strength Versatile layering performance Temperature-regulating 1/4 zip design Imported MATERIAL AND CARE Responsibly Sourced Superfine Merino Wool, Nylon Added For Durability