Castelli has signed Mirinda “Rinny” Carfrae and Timothy O’Donnell, of the high-powered Trek/K-Swiss Triathlon Team, to exclusive apparel contracts for 2013. The sponsorships are further evidence of the Italian brand’s continued expansion in the triathlon market, which also included the establishment earlier this year of a separate, dedicated triathlon division within the company.

Carfrae and O’Donnell will race exclusively in Castelli apparel and use the company’s unparalleled cycling line for all bike training. Additionally, both athletes will provide testing and feedback throughout the season as astelli continues to push the technical boundaries with its triathlon offerings.

The Castelli apparel looks great and feels great on,” said Carfrae, who won the 2010 Ironman World Championship and has finished on the podium in all four of her appearances at Kona. “The company’s attention to detail combined with the Italian fabrication is evident in every piece. I look forward to being involved with their triathlon launch.”

O’Donnell, Carfrae’s teammate and fiancé, will also be targeting Kona this year. A former ITU Long Distance World Champion and longtime Ironman 70.3 standout, the former Naval officer has turned his attentions to full Ironmans and finished eighth in Kona last year. He’ll definitely be one to watch in October as he tries to become the first American man to win Kona since 2002.

“I’m excited to be partnering with Castelli, a legendary brand in cycling, as the company now makes its mark in triathlon apparel,” O’Donnell said.