cunningham2076974 wrote an answer about G3 Alpinist Climbing Skin on July 27, 2010
You can always narrow the width of skins by cutting (and on BD skins you can shorten their length). Some people that are really serious on weight will pick a narrow skin that does not cover their whole ski. However, if you don't want to slide around, especially while traversing harder snow, pick a skin that is of equal or greater width than your skis widest dimension and trip the skin so there is 0.5cm of ski exposed on either side of your skin. Also a consideration for some mountaineers is that narrower skins are easier to put on your ski with high winds, but I think that's just about practice.