Hey Slo, i have some of those really neat/cool shirts that i use exclusively when i ride. So i just ran upstairs to check and see what materials they were made from and then realized that as i am checking each one of them... i am a tag ripper! Not one of them have the tag still on them, sorry. The little shop that i get them from is just one city over from me. So if no one else grabs the info for you i'll ride over there tomorrow and get the info for you. I know they are a Cotton/Poly/Spandex blend and are so very comfortable to wear/ride with.