509 F05000500-150-001 - Alpine Merino is a 250 gsm blend of 50% 20 micron Merino wool natural fiber, 40% super soft vicose fiber, and a Nylon core for structure and durability. Fit for Ergonomic Rider position Flat lock stitching for low profile and comfortable fit Warmth : LVL 2 The FZN Merino layer uses a Merino wool blend that is high performance and comfortable in all conditions. A unique knitted blend uses 20 micron Merino wool, and this natural fiber has incredible moisture management and temperature management capabilities. Stretch keeps in place and a fit that is supportive and comfortable for all day riding. Turtle neck zip for great layering and less bulk, 1/4 zip.