First batch produced, red on grey, these are designed to allow teams to write their challenge numbers around them. This is done for several reasons, primarily they allow staff to record progress and timings if necessary. So when you cross the finish line make sure you hear your number being called out!! We do know that these will get darker when wet and of course muddy throughout but we will gather the info that we need as you smash through the finish line! Remember to pick up one for each team member at event day check in and write your numbers clearly on each one.