I need long sleeve undershirt under my...
I need long sleeve undershirt under my jacket for snowboarding activity
I'm not sure what your question is but this shirt would serve that purpose well. It is a bit on the light-weight side of things so if you are snowboarding in really cold temps you may want to look for something heavier. Personally, a t-shirt and a long-sleeve like this are all I need under my jacket.
I suggest long underwear made of polyester. These shirts are designed for snowboarding: