Many shoe lacing methods have been developed with specific functional benefits, such as being faster or easier to tighten or loosen, binding more tightly, being more comfortable, using up more lace or less lace, adjusting fit, preventing slippage, and suiting specific types of shoes. One such method, patented in 2003 as "Double helix shoe lacing process", runs in a double helix pattern and results in less friction and faster and easier tightening and loosening. Another method, called "Rinlers Instant Lace Up", use additional accessories for instant tightening and loosening.