Lange Fluid 10 Ski Boots 2010: The Lange Fluid 10 Ski Boots are a high performance boot designed for the skier who needs the performance of a plug boot, but would like a little more room for the foot. Lange’s design philosophy of a hinged boot and a long flex pattern set the foundation for the Fluid shell. A Power Spoiler on the upper cuff adds additional power to the inside of the boot and a 3DL tongue eliminates the need to stitch multiple materials together which means no seams on the tongue. Optional 1.5 degree canted soles can be used to create a balanced stance. Delivering optimum performance on-piste, the Lange Fluid 10 Ski Boots are perfect for any intermediate to advanced all-mountain skier.