I have had Raynaud's for 40 years. Mostly very cold fingers and toes for the first 20 years that progressed to frequent total shutdown of the vessels turning my fingers deathly white or almost black until I could get them in warm/hot water. I am unable to use any type of bp medication so I keep hand warmers in my pockets most of the time. The chemical type take too long to warm up, and sometimes never get warm enough to be helpful. The rechargeable kind are very helpful. They sell them on Amazon. I am always searching for gloves that are helpful, but mittens work best for me. I'm also hoping to find something for my feet while hiking in the winter. The Little Hotties burn the bottoms of my feet, and the battery heated socks work well, but bag around my ankles. If anyone has found a brand they love please share. Thanks.