The golf shirts on the market today feature a roomier chest, larger arm holes, longer sleeves just to the elbow and an extended shirt tail. The oversized features allow freedom of motion during the golf swing.
The climate cool material is made of 100% polyester that will keep you cool on those hot and humid days on the links. Due to the moisture wicking technology, this material actually removes the perspiration away from your skin to keep you dry. When your skin is dry you naturally feel cooler. The anti-bacterial finish helps eliminate body odor. If you tend to perspire a lot I would highly recommend this type of material. Stay away from the 100% cotton material for your golf shirts because when they get damp from perspiration or rain they tend to restrict your swing.
For more added comfort some manufacturers like Adidas and Izod heat screen their size labels into the neck for tag less comfort. Everyone has had a golf shirt that the size label has rubbed you the wrong way. Cutting it off does not help, it actually makes it worse. Then you try taping it down, it works for awhile until the tape falls off and then you're back to the same situation. With the new tag less label you never have this problem.
The new materials that the manufacturers are using now will keep their shape and comfort level up for many laundry washings. The UV rays from the sun will not fade them as much as the 100% heavy cotton; These shirts tend to fade around the collar and the shoulder areas from just being out in the sun. This is especially true with the darker colors.
The original classic fit polo shirts features are somewhat smaller in the chest and sleeves. The sleeves extend halfway down on the bicep and the arm holes are smaller. These features may restrict your golf swing a bit if your intent is to wear it while playing golf. Stick to the golf shirt for the added comfort.
There are two other styles of polo shirts to choose from. The custom fit polo is smaller in the chest, has shorter sleeves and shorter shirt tail. The slim fit polo has the narrowest chest of the two and is not made to tuck in your pants. These two styles will wear well under a sport jacket but are not recommended to wear for a round of golf.
Both the golf shirts and the polo shirts are designed to keep you cool and comfortable on the links or at a back yard BBQ.
I have pointed out some of the differences in them, so now hopefully you have more information at your disposal to you make your next purchase.