SIMPLE. RUGGED. MINIMALIST The ST System combines Hollis' most popular single tank components into one, both including the Solo harness for the ultimate in simplicity and streamlining. This kit is preassembled from the factory and includes unique components depending on the configuration. For warm water and travel destinations there is the ST Travel, which includes the ST22 wing Aluminum backplate 2.0, Delrin cam bands and Backplate backpad 2.0. While those diving in colder waters can choose the ST System, which includes the ST35 wing, Stainless Steel Backplate 2.0 and Backplate backpad 2.0. ST22 Wing (22lbs lift) Solo Harness w/ Aluminum Backplate 2.0 Backplate Backpad 2.0 Delrin Cam Bands