U.S. Merino Wool: Production and Grading Explained

Understanding American Merino Wool

Merino wool is prized worldwide for its softness and performance, but not all merino is created equal. Here's what you need to know about U.S. merino production and how wool is graded.

U.S. Merino Production

While Australia dominates global merino production, the United States has a smaller but quality-focused merino industry. American merino sheep are primarily raised in Western states—Montana, Wyoming, and parts of the Southwest—where climate and terrain suit the breed. U.S. producers focus on sustainable practices and high-quality fiber rather than volume.

American merino wool tends to be slightly coarser than ultra-fine Australian merino, but it's still significantly softer than standard wool and offers excellent performance characteristics for outdoor gear and apparel.

Wool Grading System

Wool is graded by fiber diameter, measured in microns (one millionth of a meter). The finer the fiber, the softer it feels and the higher the grade.

Ultrafine Merino: Under 17.5 microns. The softest and most expensive. Rare in U.S. production, mostly from Australia.

Superfine Merino: 17.5-19.5 microns. Extremely soft, next-to-skin comfortable. Premium grade.

Fine Merino: 19.5-21.5 microns. Soft and versatile. Common in quality U.S. merino production. Great for watch caps and base layers.

Medium Merino: 21.5-23 microns. Still soft, durable, and warm. Excellent for outdoor gear that needs to withstand heavy use.

Strong Merino: 23+ microns. Coarser but extremely durable. Used for outerwear and rugged applications.

What This Means for Your Gear

Most U.S.-produced merino wool falls in the fine to medium range (19.5-23 microns). This is the sweet spot for watch caps and outdoor apparel—soft enough for all-day comfort, durable enough to handle real-world conditions, and naturally performance-driven.

When you see "merino wool" on a product, the micron count matters. Anything under 23 microns is considered merino grade and will be noticeably softer and more comfortable than regular wool (typically 25-35 microns).

Why U.S. Merino Matters

Choosing U.S.-produced merino supports domestic ranchers, reduces transportation emissions, and often means better traceability and animal welfare standards. While it may cost slightly more than imported alternatives, you're getting quality fiber from sustainable sources closer to home.