Jeremy Seewer nose apparatus???

Nasal Dilator? 

https://oxygenadvantage.com/product/nasal-dilator-sports/#:~:text=What%20is%20Nasal%20Dilator%3F,fueling%20your%20muscles%20with%20oxygen.

The insurance bills it as " medical grade ductile support compound "

Not paperclip  Sure as hell looks like one !

https://noson.ch/en/product/noson-premium/

A few euro cyclists use them. 

They work great. I use the Windham bend.

Probably helps after going through this. Dudes gnarly 

Probably has a deviate septum. He should get it fixed in the offseason. Got mine done, so much better.

Breathing through your nose lowers the heart rate with a couple of beats per minute. Also helps with reducing lactic acid. Also avoid getting dust in your mouth and swallow few pounds (...) of sand on heavy sand tracks.

So pure science behind it. Run similar for every race i do. Practice without it.

Tongue posture is a game changer. It sounds stupid, but it works. It got popular a few years ago as “mewing” which some guys thought could help them grow gigachad jawlines or whatever. I don’t know about all that, but it’s a shame because it actually has some scientific basis for sinus function. 
 

The basic idea is that you keep your tongue pressed into the roof of your mouth and it gradually gets easier as you get stronger. The effect is that your tongue creates a kind of foundation for your sinus structures to rest on so they don’t collapse or require pressure to keep shape. It makes a big difference in sinus function and overall health.