Norelco Rotary Shavers
A Norelco rotary razor might also qualify as a green gift for Dad. It delivers close shaves without using any water. In contrast, a traditional blade razor requires a sink full of hot water or extra time in the shower with a mirror. In a typical household, traditional blade shaving wastes a lot of water. In contrast, an electric shaver does not require water and can be used while other morning activities are being handled.
Since you are freed from the sink and water, you can really use the Norelco Rotary razor anywhere. Over the years, I've sometimes found it convenient to take my Norelco Micro Action Plus rotary razor to work with me. In a pinch, you can shave in your car before walking into work, you can shave while waiting for the bus, or you can shave in a restroom at work.