It protects from sunlight and rain/snow (it is waterproof). There is a drawstring at the bottom to hold it tightly.The cover is made of 210D high-density and breathable materials. Provide UV protection to prevent fishfinder paint from falling off and fading.Fits Lowrance, Humminbird most 7" models and some 8"At the bottom of the cover, an adjustable drawstring is added to make it fit more closely to the fishfinder, the fixed cover not be blown away, and the windproof effect is stronger.Make your fishfinder protected while prolonging its service life.Check if the size and equipment are appropriate before buying.