This Castelli vest fits great and capably fills the wardrobe gap when you need some light protection from the elements. I've used the Superleggera now several times, over just a springsummer jersey w arm warmers when 45-55 degrees, and its a perfect layering option. I'ts light weight and packs well when its time to shed a layer. I have also used this vest when running. There are no pockets, which is worth knowing prior to purchase, but has not proven to be any problem. Even with a somewhat trim fit, there is sufficient room to stuff your jersey pockets under the vest. I love this vest!