I have RS also...I started to notice after minor frostbite while skiing about 15 years ago. It usually only affects two adjacent fingers on my off hand. I often get it while cycling in temperatures as warm as 50 degrees. For me it's not a core temperature issue, just cold exposure to my digits! It helps to move the fingers a lot. I open and close them with my palms on the bar. It often takes me 15-20 minutes to get the blood flowing in the cadaver- like fingers. Tight gloves also exacerbate the problem. I always buy ladies large or men's small gloves.