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How does the Apex patent-pending Serpentine lacing system work on the walking boot?

The XP and XP-L models have a patent-pending Serpentine lacing system which provides for a more secure and comfortable closure over your instep (upper foot). The Serpentine lacing acts as a pully system, drawing the tongue down over your instep instead of pushing down like a traditional cross lacing. The pully-like action and the subsequent very secure fit over the instep allows for much improved heel retention. Maximum heel retention is the primary goal of a great ski boot fit.