Badminton - tack question

I am just watching the recording of the Badminton XC and I am seeing quite a lot of horses with what looks like a square of black material below the noseband - can anyone tell me what it is?
 
it's a Flair strip... the horsey version of "go faster plasters" that athletes use, supposed to open the nostrils a little more to let more air in.
personally, i think horses are amazingly designed running machines, and don't really need any improvement on nature to help them get more oxygen!
 
Thanks - Breathright nasal strips for horses! Do you think it stops them snoring too?
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