One of the biggest worries paralympians have is sustaining injuries in areas where they won't be able to feel it. After all, if they don't even know they're injured, they might end up bleeding to death. That's why a group of students from London's Imperial College and The Royal College of Art have teamed up to create Bruise pants, which show paralympians where they're injured and how severe it is. The designers sewed pressure-sensitive films made by Fuji onto a pair of Lycra leggings, marking vital points where injuries would be most damaging. In the event that any of those areas sustain impact damage, the film develops a red stain similar to blood seeping through cloth. If the color's showing up as a deep, dark magenta, that means it's time to stop and find the medics.