oh shit, is he going to ski on it or just wants something warm becsue he regular gloves won't fit around the cast? I'd suggest not skiing to stay warm if its the first one.
ask the doc to make a special one cuz my bros friend fucked his up and then the day after he broke it he was skiing with one pole tho...and the doc just like separated it or something...it was sweet
just put your arm inside your jacket. I dislocated my shoulder and i ski with a sling and my arm under my jacket. it doesnt really affect my skiing once you gte used to no poles.