High in the Peruvian Andes, above 3,500 metres where little else can thrive, alpacas have been producing some of the world's finest fibre for thousands of years. Their wool — technically called fibre, since alpacas aren't sheep — has a reputation for exceptional softness, warmth, and durability. But does that reputation extend to sustainability? The short answer is yes, with some caveats worth understanding. Alpaca wool scores 87 out of 100 on the Fashion Sustainability Index

A well-made winter sweater earns its place in your wardrobe. It's the layer you reach for on cold mornings, the piece that travels with you through seasons, the garment that somehow feels like home. But the materials that make knitwear so comforting come with environmental costs that vary enormously—from devastating overgrazing to near-zero impact recycling processes. The good news is that choosing sustainably doesn't mean sacrificing warmth, softness, or durability. Some of