RainRider, a German company, is making the RainRider Softtop grau with a foldable diaphragm for rainy days. It has an umbrella that can be folded when stopped and can cover the entire bike. When not in use, it can be folded like a tent and stored in a special bag.
The material is waterproof coated polyester and UV-resistant polyurethane, and the bike and the assembly are fixed to the handlebar and front fork. It is 215 cm high, 40 cm wide and weighs 1.5 kg. The price is 129.95 euros. Related information can be found here.