Please read! Lowest price. I don’t know if this is the Swiftly tee. It is the same material as that, but cut is different. It has a boxier fit, is shorter and has a wider neck opening. I don’t know the sizing. I wear an 6 or 8 in Lulu and this fits well. May even be small or medium. Normal light wear, no issues. 20” across chest (armpits) 22.25” length 9” opening at neck (at top of opening)