Sometimes it’s the simplest gadgets, but it’s pretty much always the simplest designs that work out best. These Amphibian Dynamic Scuba Fins picked up an award at the IDEA 2008 design festival and it’s not hard to see why.

Anyone who’s ever done any diving or snorkelling will be fully aware of how flippers turn from something totally useful and essential in the water to footwear that’ll nearly kill you on land. So, the way these ones work is that you hit a switch at each ankle with the opposite heal and, hey presto, the fins flip up