2XU Men's Core Compression Tights for Running & Workout - Performance Enhancing & Muscle Recovery Leggings - Ideal for Gym, Marathon Training & Post-Workout Recovery

I've run several marathons in the past year and constantly struggle with elevated heart rate and nausea. I believe it's due to blood pooling in my legs and not properly cooling down at the end.After my 20 mile run a week ago I had to elevate my legs for 15 minutes to prevent throwing up, so I did some research and wanted to try these graduated compression tights to see if they'd help. I've included some workout details to show that they helped, a lot.With nearly the same average heart rate, same weather, close to the same distance, I was able to run 1 minute and 17 seconds faster per mile. The tights also sped up my cadence due to a tighter range of motion with my legs, I think that helped with the performance as well. No nausea at the end, legs felt great after my long run.I'm 5'10" and ordered the small size. The tights are difficult to get on and off, but I think that's necessary for them to work well. It feels like the right size for me. Awesome, looking forward to my next marathon with them.