MERRELL SIREN 3 VENT J033906 brand Merrell Insulating film of aluminum inside filter Fall Boots Insulating film of aluminum inside the base of the boot to prevent the cold from penetrating Melding a classic mukluk silhouette with modern craftsmanship and minimalist design FEATURES• Mesh and TPU upper• Webbing loops for secure fit• Hyperlock™ molded TPU heel counter for security• Bellows tongue keeps debris out• M Select™ FRESH antimicrobial agents reduces shoe odor• Kinetic Fit™ Tri removable contoured EVA insole provides light support to all three arches of the foot• Q FORM™ 2 dual density midsole with heel centering technology provides gender engineered alignment and comfort• Vibram® Megagrip®• 4 5mm lug depth• Weight: 1lb 4oz 564g