Alpaca vs Vicuña

Alpaca is more durable. Vicuña is softer.

AlpacaVicuña
Typical diameter18–32 µm12–14 µm
SourceAlpacaWild vicuña (sheared under license)
LanolinNoNo
Warmth★★★★★★★★★★
Softness★★★★★★★★★
Durability★★★★★★
Luster★★★★★★
Elasticity★★★★★★
Price$$$$$$

Bottom line

Warm for its weight, lanolin-free, silky hand; less elastic than wool.

The finest and most expensive animal fiber on the market, from live-shearing of wild vicuñas in Andean communities.

Choose alpaca for warm, drapey, lanolin-free garments; choose vicuña if you value softer. Blends often give the best of both.

The vicuña or vicuna is a wild South American camelid which lives in high alpine areas of the Andes. It is a relative of the llama, the domesticated descendant of the guanaco, the only other still wild South American camelid.From Wikipedia — “Vicuña”, licensed under CC BY-SA 4.0.

FAQ

Is alpaca better than vicuña?
Alpaca is more durable. Vicuña is softer. Warm for its weight, lanolin-free, silky hand; less elastic than wool. The finest and most expensive animal fiber on the market, from live-shearing of wild vicuñas in Andean communities.
Is alpaca warmer than vicuña?
Vicuña is at least as warm as alpaca.
Is alpaca softer than vicuña?
It depends on the grade: fine alpaca (18–22 µm) is very soft, while vicuña typically measures 12–14 µm.