4mm Neoprene cover designed to insulate and protect surface mounted downtube batteries from inclement weatherFits surface mounted battery and compatible with Bosch, Shimano Steps, Samsun, YamahaProtection against the elements while riding or transporting on a car rackInsulates battery to help operate more efficiently in cold weather Integrated pocket holds a phone, keys or walletVelcroLargeBlackUPC/EAN/GTIN: 859402006895