The general rule is to choose a leash of the same length as the surfboard, to avoid possible injuries. In small waves we can choose a leash a little shorter than the board, while in big waves, it is better to choose a leash a little longer than the board. For the diameter, the standard is 7mm, but in small waves we can choose a leash with reduced diameter (Comp) to reduce the weight, while in larger waves, it is advisable to choose a leash with a superior diameter, to obtain a better resistance.
											
							
																	
																					| Surfboard Length | 
																					Small waves (knees height) | 
																					Medium waves (chest height) | 
																					Big waves (head height) | 
																			
																	
																					| < 6' | 
																					Length: 5' - Diameter: 5-6mm | 
																					Length: 6 ' - Diameter: 5-6mm | 
																					Length: 6 ' - Diameter: 7mm | 
																			
																	
																					| Between 6'0 '' and 6'6 '' | 
																					Length: 6 ' - Diameter: 5-6mm | 
																					Length: 6 ' - Diameter: 7mm | 
																					Length: 7 ' - Diameter: 7mm | 
																			
																	
																					| Between 6'7 '' and 7'6 '' | 
																					Length: 7 ' - Diameter: 7mm | 
																					Length: 7 ' - Diameter: 7mm | 
																					Length: 8 ' - Diameter: 8mm | 
																			
																	
																					| Between 7'7 '' and 8'6 '' | 
																					Length: 8 ' - Diameter: 7mm | 
																					Length: 8 ' - Diameter: 7mm | 
																					Length: 9 ' - Diameter: 8mm | 
																			
																	
																					| > 8'7'' | 
																					Length: 9 ' - Diameter: 7mm | 
																					Length: 9 ' - Diameter: 8mm | 
																					Length: 10 ' - Diameter: 8mm |