Castelli mounted little hooks on every short and top that strap together, giving a bit of support for the shorts and preventing the top from riding up. If the hooks look like bra hardware, that’s because they are. This could help prevent the top from bunching, which leads to increased drag according to Castelli, and to keep the lower back covered to prevent sunburns. It may also provide a subtle bib-like effect to keep the short from bunching, although it’s only fixed in the rear.
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