When sourcing cashmere sweaters on Alibaba.com, understanding fiber grade classifications is the foundation of making informed purchasing decisions. Cashmere quality is primarily determined by two metrics: fiber diameter (microns) and fiber length (millimeters). These specifications directly impact softness, durability, pilling resistance, and ultimately, customer satisfaction.
Cashmere Grade Classification Standards
| Grade | Fiber Diameter (Microns) | Fiber Length (mm) | Characteristics | Best For |
|---|---|---|---|---|
| Grade A | 14-15.5 | 34-36 | Finest & longest fibers, cloud-like softness, excellent durability, minimal pilling | Luxury brands, premium retail, high-end B2B contracts |
| Grade B | 16-19 | 30-34 | Good softness, moderate durability, some pilling over time | Mid-range retail, corporate gifts, quality-conscious buyers |
| Grade C | 18.5-30 | 25-30 | Coarser texture, shorter fibers, prone to pilling, less durable | Budget retail, promotional items, price-sensitive markets |
Why Grade A Commands Premium Pricing: Grade A cashmere fibers are harvested from the undercoat of cashmere goats during their natural molting season, typically in spring. The 14-15.5 micron diameter is finer than human hair (approximately 75 microns), creating that signature 'cloud-like' handfeel that luxury buyers expect. The 34-36mm length allows for tighter spinning, resulting in garments that resist pilling and maintain shape after multiple wears and washes.
The Pilling Misconception: A critical insight from recent Reddit discussions among cashmere enthusiasts is that 'no pilling' is no longer a reliable indicator of quality. Modern manufacturing sometimes uses chemical treatments or shorter fibers that initially appear pill-free but degrade faster. Genuine Grade A cashmere will develop a soft patina over time—this is natural, not a defect. What matters more is fiber diameter consistency and spinning quality.
Grade A cashmere (14-15 microns) is the finest and longest (34-36mm). Grade B is 15-16 microns (30-34mm). Grade C is 16+ microns and the shortest. Grade A feels like clouds and is more durable with less pilling. Grade C pills easily and feels rough [2].

