In creating the Rosso Corsa Pro 15 Sock, the design team at Castelli wanted to deliver the best possible high performance summer cycling sock ever made. No small task, as there are many excellent options, including their previous Rosso Corsa model. Yet, with patience and superior knowledge of sock requirements from their long sponsorship of numerous pro cycling teams, the team at Castelli had many advantages.

By tapping into their experience with Meryl Skinlife yarns, a premium option and an industry leader, the designers used multiple-structure knit to get the exact proper performance in every segment of the sock design- a top foot cool mesh, padded forefoot, compression midfoot, and even a reflective tab on the rear. Overall, a 200-needle with excellent stretch was used, but an asymmetrical right/left specific construction was employed to mirror the shape of each foot, rather than rely simply on stretch to get the proper fit and feel. The overall sensation is that of a skin-like layer that won't bunch or pull, preventing pressure points and chafing. The Meryl Skinlife yarns also contain naturally antimicrobial silver ions, which inhibit odor build-up in conjunction with the hydrophilic properties of the yarns themselves, keeping you feet as dry, cool and fresh as possible on the hottest summer days and hardest efforts.