Support rail for attachment of helmet accessory to a helmet, as well as helmet accessory, support system and helmet

A support rail for attachment of a helmet accessory to a helmet, wherein the support rail comprising:

• a top side;
• a first receiving side;
• a second receiving side;
• and
• a third receiving side;
• wherein the top side has an attachment groove configured to be fixed to a bottom side edge of the helmet;
• the first receiving side having a first retaining groove;
• the second receiving side having a second retaining groove;
• the third receiving side having a third retaining groove;
• the first retaining groove, the second retaining groove and the third retaining groove are each configured to receive one or more engagement elements of a helmet accessory;
• the attachment groove, a length of the first retaining groove, a length of the second retaining groove and a length of the third retaining groove each extend in a longitudinal direction of the support rail;
• and
• each of the first retaining groove, the second retaining groove and the third retaining groove having one or more sides terminating at a bottom surface.