About the Burton Treeline Stay warmer. Stay drier. The Burton Treeline Mittens cover all the basics so you can ride harder for longer, even when things get crazy cold. These mittens mix a soft, supple and durable leather palm with a waterproof DRYRIDE shell and ThermacoreECO insulation for a super-comfortable feel in all conditions. They're touchscreen compatible too, with cunning tech that lets you manage your phone without baring flesh. Complete with a pre-curved fit for a natural feel and grip, the Treeline Mittens are tailor-made for a toasty and comfortable ride every time. Treeline Ski/Snowboard Mittens