well it depends, 108 is definitely going to be at the bottom of ur knees, while the 102 will be like 2 inches above. It will shrink if u don't air dry. But, if u are planing to wear it like a shirt with nothing under it, go 102, but if you go with something under it like a hoddie, get the 108. But hey i don't know how big u want it to fit, so go on the site and look at the size chart!