The Prologo series jersey has been a mainstay of Castelli for the last half decade. The Prologo VI LS FZ (Long Sleeve, Full Zip) gets another update for this season, but stays true to its classic styling and simplicity. This is a long sleeve jersey that is ideal for cool, damp mornings in the early summer, or with a wind vest or jacket during moderate shoulder season conditions. The details for the Prologo always represent the leading edge of Castelli's comfort and performance technologies. The crisp, clean logo across the chest is laser cut and bold, yet simple. The full length YKK zipper ensures trouble free use and is light; laying flat on the body.

The Punto fabric has been upgraded to have a slightly softer feel, better moisture management and cooling properties. The fabric is remarkably soft yet stretchy and features bioceramic nanoparticles added to the fused polymer, which reflect far infrared light to both protect you from hot sun and help the body keep itself warm.

The Prologo VI LS FZ is a form-fitting jersey, but more generous than a true race cut. This is not an aesthetic choice, but a functional one. The material technology that makes the Prologo special requires skin to fabric contact to be effective. While the jersey doesn't need to be skin tight, you want the material to glide over the skin and/or baselayer to maximize its capabilities.