Start Synthetic Kick waxes are reliable, durable, and fast in a broad range of snow types. Optimal grip and speed is in aged, drier snow with round to coarse grain crystals. Made with synthetic thermoplastic materials that adapt well to temperature changes Yellow for air temperatures +3 to +1deg C (38 to 34F) Purple for air temperatures +1deg to -3degC (34 to 26F) Blue for air temperatures -2deg to -6deg C (28 to 21F) Green for air temperatures -5deg to -10deg C (24 to 14F) Fluoro-free