Another thought I've had is whether anyone has tried neoprene wrist seals with si tech rings? I know you can install neoprene seals in their neck systems now?
I'm likely going for offboard heat in the next while and will experiment with thin neoprene gloves
Neoprene neck seal has been available by Waterproof for the Si-Tech neck ring systems for a few years now. I don't believe just any neoprene neck seal can be used...my understanding is the Waterproof neoprene neck seal is thinner around its base so that the yellow retaining ring of the neck ring system can be properly fitted to secure the seal to the ring system.
I don't recall seeing neoprene wrist seals for the si-tech rings, yet....perhaps a set of neoprene wrist seals can be ground thinner, with a sanding drum on a dremel tool, so they can be mounted in the rings.
-Z