This classic might be useful http://forums.epicski.com/showthread.php?t=41637
The following is copied over (with slight modifications) from http://forums.epicski.com/showthread.php?t=521
, provided by PhysicsMan:
"One should be very careful about extrapolating from one's own experience using normal width skis in soft snow when making ski recommendations for people of substantially different weights. Here's why:
Lets assume that there is some validity to the oft-heard claim that mid-80's skis are the best thing since sliced bread for average weight guys (say, 175 lbs) in soft snow. Then, one can estimate the width of a ski that would give the same amount of float to a skier of a different weight. Here's a table that does this:
Thus, if you are a little slip of a 120 lb woman, you will have the exact same float on a 58 mm wide pair of skinny boards that Mr. Average Guy (at 175 lbs.) has on his 85 mm "lite-fat" skis.
Basically, on any sub-70 mm ski currently being sold (because they are all greater than 60 mm), Ms. 120 Pounder will sink in less than Mr. Average Guy on his Rex's, so its to be expected that a light weight person might not fully appreciate the need for fatties (at least from direct personal experience).
At the other end of the spectrum, at 210 lbs, I will need to be on 100 - 105 mm boards to achieve the same float as Mr. Average Guy on his sticks.
Bottom line - guys, especially big guys, have a valid point in wanting to be on wide skis in soft snow. And, to head off any comments, yes, we have all skied powder in 207 cm long, 64 mm straight sticks from the past, so fatties are not absolutely required, but sure are fun and make marginal snow much easier.
This issue has been discussed *many* times before on Epic, for example, most recently:
Tom / PM
The general opinion is that a lighter skier does not need a wider ski. How light is user?