The EXO17 Support Vest with Extenders from Letus35 is a support system that is compact, lightweight, and designed to be used with the Helix St. gimbal (available separately). The front-mounted design allows you to get in and out of a car with ease and to carry the gimbal for an extended period. This support vest features a regular-strength spring caster with a payload of 28 lb. It also features 9.5" medium arms.