sick did you rip it? 12k feet aint that bad, anytime I complain about oxygen at moderately high altitudes I think of people trucking up Everest with tons of fucking gear and I think to myself, shut up bitch
its crazy how much of a difference a thousand feet can make though...I spent alot of time last winter hiking around 11,000 feet and got to the point where I didnt get out of breath at all...then I went to silverton and we were hiking at 12,500 to 13,000 and i couldnt fucking breath a bit.