Hands down the best fit, most comfortable line out there. I loved my order so much the day it came in I ordered more. I'm a very small busy woman and these tops fit in all the right places! The contrast in this tank is gorgeous the colors just pop! I get so many compliments on my RokFit! Sizing is on point being an XS for life its really tough to find enough options in fitness apparel in my size and yes there is a huge difference in XS and S! The quality of the tops- they are soft and thin enough where you can't see through them but thick enough you're not sweaty and gross - breezy and appreciated. I'm hooked!