I am wearing the Hanes Cool Dri polo shirt right now. It has a ribbed collar and flat-seamed sleeves. WHAT I LIKE: The fit is exactly the same as every other Hanes polo I have worn — just order your usual American size. It’s a standard, traditional fit — it isn’t elastic, form-fitting, or clinging. The polyester fabric is very light and cool with a finish that is smooth, not meshy or lumpy. The finish is a little slippery, but that’s not a problem for me. I ordered black, which is very dark and opaque (not see-through). The price was very reasonable. I wash the Hanes Cool Dri polo shirt in biodegradable detergent on regular cycle with tap-cold water and maximum spin, and the shirt comes out wrinkle-free. Then I hang it on a plastic hanger on the shower rod and it is dry in a few hours. So that’s minimal care in my book. If you want to travel with the Hanes shirt, it packs light and hasn’t wrinkled, yet. If you want a shirt you can rinse out and hang up to dry overnight, this is it. WHAT I DON’T LIKE SO WELL: The only thing I don’t like is that the short sleeves are a little long, reaching to the middle of my elbows. I was going to send it back over the sleeves, but trusted advisors tell me that it looks fine. So, if it looks fine, it’s OK with me. DURABILITY: I have been testing my Hanes Cool Dri polo shirt by wearing all the time by itself and under a sweater or jacket for warmth. So far, my shirt has not shrunk, wrinkled, snagged, or pilled — the seams are still sewn tight. I wish I had longer term durability data for you, but then you couldn’t be reading my review now. ENVIRONMENTAL ISSUES: Hanes Cool Dri polo shirts are made of synthetic polyester with no elastic fibers (like Lycra or Elastane). Polyester fabric is strong, clean, slightly absorbent, slightly shrinkable, and can be recycled. Lots of polyester is recycled from plastic water bottles, so that’s a good thing. Unfortunately, polyester is not very biodegradable (land fill estimate=100 years), although some bacteria and lichen have been found that degrade them. My Hanes Cool Dri polo shirt was made in El Salvador. RECOMMENDATIONS: Right now, I’m recommending Hanes Cool Dri polo shirts if you want a super light, inexpensive shirt and don’t mind the sleeves a little long. If I change my mind or my Hanes polyester polo develops problems, I’ll publish an UPDATE on my Amazon profile page (just click my name). You’re welcome to read more of my reviews, check for UPDATES, & follow my profile — click my name, above. I hope this review has saved you time and has been really helpful. Enjoy!