A double-edge razor is a type of shaving tool that uses a blade with two sharp edges. This design allows the user to flip the blade for a fresh edge, extending its lifespan. Double-edge razors are often made of metal and can be more environmentally friendly than disposable razors, as they generate less waste. These razors require a bit of technique to use effectively, as they can provide a closer shave than some other types. Many users appreciate the cost-effectiveness of buying replacement blades, which are typically cheaper than cartridge systems. Popular brands include Merkur and Feather.