Here are the differences:

It's roomy for a quick change

providing warmth and flexibility as you move

high efficiency

Since this is a very technically advanced trick scooter component

Eharness (w/o Box&battery) neopren accessories Here are the differences:This lightweight harness is specifically designed for the Foil Assist battery box. It is made from ultra soft molded EVA for comfort and added buoyancy. It features a low profile with a tapered waist for freedom of movement, lumbar support to keep it in place while riding, a D ring attachment for your leash, and a neoprene waist belt with a Fidlock magnetic buckle for security and quick release. If you need to replace your current eHarness due to wear