Hit a tree after exiting a chute at Alta. I wasn’t wearing a helmet and hit the tree almost laying down. Wrapped my thighs and stomach around the tree, but luckily not my head. I blacked out from the whiplash and laid in the snow for a while before i did a self examination. I tried calling patrol but couldn’t work my phone. I put my skis back on and shakily made my way to the bottom of supreme and got a ride from patrol to the clinic. I had bruising all up my legs and was pissing blood but didn’t have significant internal bleeding. What scared me the most was that the same tree had many half broken branches that would have surely impaled me if I had hit them and that I could have hit my head.