An article of footwear, such as a boot, including an outer sole assembly and an upper, the boot extending lengthwise from a rear end to a front end, widthwise between a lateral side and a medial side, and heightwise from the outer sole assembly to an upper end of the upper, the upper including a lateral quarter and a medial quarter, the boot including a first tightening device, which itself includes a linkage and a quick-locking device, the boot including a cover flap. The flap demarcates a storage space capable of receiving the quick-locking device.