"Temperature Adaptability is extended to year round use by Dry Vents. These large vents are positioned under the arm and allow air to circulate through the jacket to your base layer, bypassing the integral insulation for rapid cooling. The Dry Vents can be used when walking in heavy, vertical rain as the stiffness of the zip forms a cowl around the vent.
The Dry Vents are large enough for you to easily remove your arm from the sleeve for rapid cooling in dry conditions. This is especially useful in reducing the faff factor when wearing a sack, body coils and harness."
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This sounds perfect for the potential Sunday weather for the marathon. Well this jacket is about to take a beating....