The Lange Fluid Ski Boot is designed for the skier who wants the performance of a plug boot, but would like a little more wiggle room for the foot. Lange’s design philosophy of a hinged boot and a long flex pattern set the foundation for the Fluid shell. The Lange Fluid 100 Ski Boot incorporates a Power Spoiler on the upper cuff to add additional power to the inside of the boot and a new 3DL liner eliminates the need to stitch multiple materials together – a real comfortable seamless liner. Also, optional 1.5 degree canted soles can be used to create a balanced stance. The Lange Fluid 100 Ski Boot is what you are looking for in power on the mountain. Worn a few times- did not fit but great boot in good condition.