Abstract: A skating boot adapted to be affixed to a chassis, the boot including a flexible, at least partially padded upper, shaped to envelope the foot and the lower leg, and a reinforcing portion including at least one rigid sole connected to the chassis and a heel reinforcement. The flexible upper includes a front foot covering portion having a rear scallop at least in the heel zone. A rear cuff, independent of the covering portion, includes a heel enveloping portion and a rising portion to envelope the lower leg. The front foot covering portion and the rear cuff are assembled detachably to form a flexible upper whose length can be adjusted. The boot is adaptable to a variety of sizes and foot morphologies, while ensuring a uniform enveloping and the same level of comfort, regardless of the adjustment length adopted.