In reply to Dave 88:
dont want to burst bubbles here, but sponsorship isnt about them giving you free shit and you just saying how good it is.
basicly the company needs to make back from you the market value of all the stuff they give you.
if youre chris sharma thats easy because people will pay just to say your name - but short of 2 or 3 'stars' sponsored climbers actually are involved in quite a bit more, sometimes reluctantly so.
usually you are required to give detailed feedback on the stuff, present on it when the company wants you to and endorse the gear not just hanging around climbing walls, but at trade shows and boring industry meetings.
the downside is you may be restricted in wearing/using what you want at certain times. its not unusal to see sponsored climbers/expeditions wearing one thing for the photos then changing after.
now, i havent looked into the mammut thing, but is it sponsoring a person, or sponsoring a trip? it may just be like a competition thing for a one off where you win a climbing holiday and have to wear their t-shirt all the time. or maybe not.
i say all this being sponsored by a certain company associated with climbing apparel - not because im a shit hot climber (im not), but because where i climb i get attention. the same company does sponsor several shit hot climbers, and i see what they do for it, and its almost like a part time job.
mind you, they are sponsored to help develop stuff, not just to climb what and when they feel like it. some of them like that, but some find it hard fulfilling their obligations (giving slide shows, photo shoots, feedback etc).
a good sponsored climber doesnt just climb well, but fulfils their contract well too.
or they can become once-sponsored climbers, of which theres plenty.