These are great T-shirts! So silky feeling on and if gotten wet, dry so quickly. As long as you DO NOT use fabric softeners (as the label says), they will retain their 'performance' properties, i.e. wicking and drying quickly. I usually wear a medium (unless the shirt is fitted) and ordered that size. Although the medium fit okay it was, for me, a tad bit too close to my body and therefore because of Jiffy GREAT POLICY ON RETURNS, returned the mediums and ordered the large. Now I have plenty of room if left out and still looks nice tucked in. I even wear them as a pajama top and because they wrinkle so little can get up in the morning and if need be run to the store if I need something for breakfast and no one is the wiser. One other nice feature is that the sleeves are not down to my elbows, even wearing the large size. Can you tell I LOVE these shirts?