Well, good for summer within reason. In 90F plus temps you'd be hard pressed to want anything called a "jacket" on you. But I have worn this jacket in 85F weather no problem with a t-shirt or thin shirt underneath.

This is my third unlined Dickies Ike jacket, and it's top quality just as the others. It's subtle and stylishly simple and very well made. It looks good, nice and clean. I bought mine primarily for riding my motorbikes in the summer heat. I don't like going with short sleeves and enjoy what I consider a minimal amount of protection when I ride. But for summer what would be durable enough to help protect my skin if I took a slide on the pavement, yet lightweight and cool enough for summer temps?

Well, these Dickies UNLINED jackets, that's what! My only gripe and the only thing that keeps this product at 4 Stars and not 5 are the zippers. Each of my jackets have a somewhat difficult zipper. I have even tried WD-40 on them and they still seem to get "stuck" sometimes near the lower part of the mechanism. However, small complaint for an otherwise fine product. Love my Ike jackets!