EXCLUSIVE AT NET-A-PORTER. Arch4s Ella sweater and leggings set is the perfect ski base layer, regardless of what color runs you choose. Its rib-knitted from Mongolian cashmere which keeps you warm without overheating, and is designed for a slim fit wear yours under your salopettes or mix and match with cozy knitwear at aprs ski drinks. brbrLower-Impact Materials. This product is made using at least 50% lower-impact materials or ingredients. Find out more about our NET SUSTAIN criteria a href=https://www.net-a-porter.com/en-gb/campaigns/net-sustainhere./a