Ultralign®+ LSO Low Profile. X-Large. 15° Tapered. The BOA® Fit System delivers a powerful and secure fit that is effortless for the patient to tighten with the turn of a micro-adjustable dial. Patented dual closure for infinite adjustability. Constructed of hook receivable material with soft, breathable liner that provides a cooler, lighter fit. Combines anterior, posterior, and lateral plastic inserts for rigid support. Available in 15° lordosis. Non-Tapered and tapered versions available for best patient fit.