[Matlock]

I was curious to what all the fuss is about and had to google

Men’s UA Coreshorts Pro stabilize your core so your muscles work better and you go faster when it’s game day.

Forget injury and anticipate energy. The ultimate in game day underwear, UA Coreshorts feature a revolutionary X design that supports an athlete’s core like no other, so you can run your fastest 40 or beat your man down the field, court, or ice. But don’t take our word for it. Just ask the pro football, baseball, basketball, soccer, and hockey players around the world who use them. Believe in the X!

Peformance DNA:

* Built for Layering, Football, Baseball, Basketball, Soccer & Hockey.
* Ultra-tight, second-skin compression fit for ultimate performance.
* Worn by the pros at the NFL COMBINE.
* The first anatomically correct compression short.
* Unique patented design delivers protection, support, and enhanced functional movements.
* Revolutionary X design mimics the functional anatomy of the body’s core area (hips, hamstrings, quads, and groin) to boost muscle performance and enhance speed activation.
* Designed to aid the recovery of core injuries by providing anatomical stability and functional support to the core area.
* 8.5" inseam.
* Body: 5.8 oz 82% Nylon / 18% Elastane; "X" Band: 16 oz 92% Polyester / 8% Doralstan.
* Imported.

source http://www.underarmour.com/shop/ca/en/pid1207672