Sky changed to a different model this year.
That was specific to the TTT apparently.
https://www.google.co.uk/amp/amp.timeinc.net/cyclingweekly/news/racing/tour-de-france/team-sky-replace-vortex-skinsuit-with-new-design-for-tour-de-france-team-time-trial-385843%3fsource=dam
Marginal pains
@danb started
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Sky changed to a different model this year.