He loses touch of his fingers in cold temps. Loses almost complete control in those environments. Plus if it flares it sticks around for a while potentially. Having a wife with raynauds it no fun. Excrutiating in cold temps 30-40 degrees and sub temps.
Raynaud's (pronounced "ray-NOZ") is a condition where small arteries, usually in fingers and toes, spasm in response to cold or stress, causing them to turn white, then blue, and finally red as blood flow returns, often with pain, numbness, or tingling.