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The precise adjustability of the Dual Zone BOA Fit System pairs perfectly with our premium R2 liner. Together, they deliver a warmer, more responsive ride. We also added eco-friendly IMPACT-ALG insoles to ensure that the Control remains on the leading edge of snow boot innovation. Step On Outsole. BOA Fit System with H4 Coiler Dial and Zonal Closure. Response Liner II. IMPACT ALG Insole. Internal Ankle Harness. Articulated Construction.