Trace Alter Semi Mat BootStella McCartney Trace Alter Semi Mat Boot These Trace Chelsea boots are a versatile vegan essential. Quintessentially British and essentially rain proof, the boots are made from our luxury Alter Mat vegan alternative to animal leather with a contrast Vibram rubber lug outsole for better grip. This pair is elevated by its back heel tab punctuated with a white Stella McCartney logo. Upper: 41% Polyurethane, 15% Recycled Polyester, 44% Rubber Lining: