"I would recommend the pack simply for its ease of use, portability, and convenience.
However, perceived soreness and HRV results didn’t lie, since I definitely felt that I’d recovered quickly and was able to resume training. While all the numbers were within range at the end of the trial period, what I appreciate most is how quickly I recovered. Hematocrit (HCT) numbers [tested at 49] even looked great considering 40-49 is optimal for endurance athletes."
Read more of Eli's review here