The Castelli Core Mesh Sleeveless Base Layer is ideal for the dog days of summer. It helps regulate body temp on the hottest of days and comes in a nice and tight, low-profile package. The fully open mesh serves mainly to hold the jersey off the skin, creating a layer of air between your skin and the jersey to help you maintain a constant body temperature.
A body wrap design with an unbelievable amount of stretch makes for a great fit. The fabric absorbs practically no moisture, and it weighs next to nothing so it won't weigh you down. Both this sleeveless and the short sleeve Core Mesh products are widely considered to be one of the best base layers in cycling.
Only a few of these base layers left. A staff favorite for many seasons, get yours before they are all gone. Limited quantity.