Helmet and chin strap

A helmet comprising:

• a shell sized and configured to be placeable on the head of a user;
• a chin strap coupled to the shell, the chin strap being formed from a semi-rigid material and having at least a first segment and a second segment slidable relative to the first segment, the first segment including a guide channel extending therein, the guide channel having a first end and a second end, the second segment being receivable within the first end of the guide channel and moveable within the guide channel toward the second end, the chin strap having two attachment portions, the chin strap being connectable to the shell at the two attachment portions, the chin strap defining a length as the distance along the chin strap between the two attachment portions, the chin strap being configured to be selectively transitional between a lengthened configuration and a tightened configuration, the length decreasing as the chin strap transitions from the lengthened configuration toward the tightened configuration;
• and
• a spring extending along a spring axis and located within the guide channel, the spring being configured to apply a biasing force on the first and second segments which urges the first and second segments in opposite directions, the elongate spring being configured to expand along the spring axis as the chin strap transitions from the tightened configuration towards the lengthened configuration.