Adult
                    
                        
                            | Size | Inches | CM | Hat Size | 
                    
                    
                        
                            | 2XS | 20 1/8 - 20 1/2 | 51 - 52 | 6 3/8 - 6 1/2 | 
                        
                            | XS | 20 7/8 - 21 1/4 | 53 - 54 | 6 5/8 - 6 3/4 | 
                        
                            | S | 21 5/8 - 22 | 55 - 56 | 6 7/8 - 7 | 
                        
                            | M | 22 1/2 - 22 7/8 | 57 - 58 | 7 1/8 - 7 1/4 | 
                        
                            | L | 23 1/4 - 23 5/8 | 59 - 60 | 7 3/8 - 7 1/2 | 
                        
                            | XL | 24 - 24 3/8 | 61 - 62 | 7 5/8 - 7 3/4 | 
                        
                            | 2XL | 24 3/4 - 25 1/2 | 63 - 64 | 7 7/8 - 8 | 
                        
                            | 3XL | 25 5/8 - 26 | 65 - 66 | 8 1/8 - 8 1/4 | 
                        
                            | 4XL | 26 3/8 - 26 3/4 | 67 - 68 | 8 3/8 - 8 1/2 | 
                        
                            | 5XL | 27 1/8 - 27 1/2 | 69 - 70 | 8 5/8 - 8 3/4 | 
                    
                
                
                    Measure the largest portion of your head horizontally with a cloth tape, measuring approximately one inch above your eyebrows and ears. If your head size is between two helmet sizes, first try the smaller size. A correctly fitting helmet should not be able to move from side to side and up and down with the chinstrap fastened for a safe fit. If it is not snug, try a size smaller. Consider purchasing other size cheek pads or helmet liners to improve fit. Some helmets are designed with exchangeable cheek pads and liners; allowing smaller cheek pads or liners, in a slightly larger helmet or visa versa.
                 
                
                    Sizing information is provided by the manufacturer and does not guarantee a perfect fit. Please use this chart as a guide only.