Canoe slalom is a timed event where competitors navigate a whitewater course by passing through a combination of upstream and downstream gates. Each course is different but can be a maximum of 300 metres in length and contain a maximum of 25 gates, with a minimum of six upstream gates. The type of gate is designated by colour, red for upstream and green for downstream. Courses are designed so the leading athletes will complete them in a time of between 90 and 110 seconds, though time penalties can be incurred for touching a gate (two seconds) and missing a gate (50 seconds).