Silver is the colour that distinguishes P ZERO Velo, the versatile tyre for road races. Silver (and yellow) is also colour of this Pirelli brand, and the Marathon Jersey: a lightweight, practical capsule top perfect for both training and racing. Worth noting, the arrow design on the rear pocket that links to the tread pattern. Blue, on the other hand, is the colour of the Climber's 2.0 Jersey, fitting in perfectly with the 4S line and the P ZERO Velo all season tyres. This jersey features maximum breathability, to make mountain climbs just that little bit easier and summer rides cooler. This, too, has the arrow design on the rear pocket. The top-of-the-range jersey in this collection is the Aero Race 5.1 with a red line, a direct reference to the red label slick tyres in the P ZERO Velo TT series. Here Castelli has achieved perfection in terms of aerodynamics and lightness, making this the fastest ever jersey: the fabrics used have been proved to save 22 Watt at 40 km/h in the wind tunnel compared to a normal bike jersey. This is a capsule that’s not just aerodynamic, but also comfortable to wear and strong.