Same scenario for me. Wife dry, me soaked. I try to stay fueled and hydrated, which helps the pre-hypothermia tremendously. I've had it so bad on training rides on the bike, I've lost my sense of balance. We're doing a pretty grueling trail in the Adirondacks today, and I plan on doing it in a t-shirt and headband. High should be about 30 on the way up. I have a fleece and a shell for a rest stop at the top, most likely wear the shell on the way down. I have zero intention of walking a slower pace, I prefer to hike ahead and look around and explore while waiting for my wife. Staying a bit on the cold side and fuel and fluid has been the key for me. I often carry a spare shirt. Changing out is an instant bit of warmth. I try to be more careful on multi-days, so I don't have to bring lots of spares.
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Charlie