Recognising most racers need their team kit clearly visible, this softshell layer with a water-repellent (DWR) treatment can be worn under any jersey for fast rides in wet and changeable conditions.
http://www.rapha.cc/gb/en/shop/pro-team-softshell-base-layer/product/SHB01
Looks like a rash vest
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http://www.rapha.cc/gb/en/shop/pro-team-softshell-base-layer/product/SHB01