It's a kite, without the strings. It's called the Kitewing. feels like a mix between windsurfing and hang gliding. Accelerates like a motorbike. No wind!!! find a hill. You can ride on a surfboard a skateboard, snowboard, skis, ice skates or rollerblades etc. basically anything that can be wind assisted and on any surface from water to land such as sand, snow, ice, grass, concrete.
