Sierra Says: This thermal bottom is ideal for the days when you need a warm, waterproof layer to keep you jonesin' in the gnarliest of conditions. Burton Says: Our Warmest First Layer.

Sierra Says: The perfect remedy for Armageddon-like temperatures, this top is not only uber warm but also very breathable. Burton Says: Our Warmest First Layer.

Sierra says: The ultimate winter warrior.

Olympic retro meets new-school high performance

Sierra says: Core comfort with a little bit of glam and style. The Burton Lightweight women's thermal crew comes in a fun and intricate design that will provide you with dryness and comfort all day long.

Sierra says: Get wild under those pants.