The cover is made of 650 g/m2 PVC material in blue. The material is varnished twice on the right side and once on the left, which prevents dirt from penetrating the structure of the material and makes it easier to keep the cover clean. Suitable for use in a temperature range of -30 degrees C to + 70 degrees C. Top-mounted cover with metal grommets and elastic or cord pull with padlock facility. The size of the cover is adapted to the model of the device. The cover surface bears the inscription "Drinking water spa closed during winter".