Purchased this hat for my husband to wear to the Kentucky Derby. It will be too warm to wear a wool hat, so this fit the bill. This hat has only a sweat band, but no lining and can be seen through, but not easily. It will go perfectly with his Derby duds and also be a nice addition to any other outside activities in the summer that head protection would be useful. He is a small man with a small head so we ordered the S-M and it fit perfectly! Love that it is available in so many colors. Highly recommend.