Kite harnesses have a hook which tapers at the base so the chicken loop doesn't accidentally come unhooked. As Seaskip has said this is dangerous for windsurfers who need to unhook readily. Windsurf hooks have parallel sides. Kite harnesses also have an attachment for the kite leash. Kite harnesses also come in a wider range of fashion finishes and colours, because those things are important to kiters!