Do these have a built in liner?

Hi Nic! The Elite 9" Short Tight does not have a built in liner.

Are these shorts made out of a different material than your other 9” tights? Is this an upgraded model?

Hi Dchristolear! The Elite 9" Short Tight is made of a lighter weight material and has minimal seaming. This tight includes 2 small pockets inside the back waistband (2 1/2" square) that will fit a small key or nutrition. The Source 9" Tight material feels a little heavier and has the side drop-in pockets that fit a phone.