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Well shell jackets are variable at best. Pile and Pertex such as Buffalo will keep you bone dry when active, but warm. Same with Paramo. Rab Vapour Rise is much lighter than Paramo but will wet out over time, however when you're active it's not so much of an issue. Have you considered a waterproof poncho?! Very breathable!
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Have you considered a waterproof poncho?!
These are fantastic tbf. I was given a good quality Mizuno one years back at Endure24 and it's been excellent as an over layer, as long as it's not too windy. Proper down to your shins length.
I wore it at an OMM once over my regular run kit with no waterproofs and everyone laughed at me, but I was happy, dry and not too sweaty!
I don’t need a warm jacket. I need the bare minimum to keep me dry. I usually wear just a light breathable t-shirt under as I’m rarely stood still when I’m out and about.