I would go long. That would give you some allowance for use with another ski, potentially. I'd also suggest looking at Black Diamond skins or climbingskinsdirect.com, as I think both those are much better skins. I think the G3 skins are pretty crumby, floppy, harder to use, and don't last as long. Climbingskinsdirect.com makes really high quality skins, and they cost about 2/3 the price of G3 or BD, although I think BD's are on sale right now. Both BD and climbingskinsdirect give better options and versatility for ski length. Hope that helps! Whichever you choose, happy climbs, and happy turns!

bahahaha! skins to get into catherines....????? shit man, your going to get trampled on pow day, I can skate and jog up that thing in about 1 minute

Once you get a set of skins,you will get hooked on getting yourself to further destinations.

Most of the time it's easiest to side-step or boot pack a short hike like that. You would spend more time getting your skins on and off then you would just going going for it sans skins. If you do decide to get into touring and doing some bigger ascents, go for the Black Diamond skins. The BD skins are a lot better.

50 yards? Just boot it, unless you want the Alta locs to be all laughing at you!

Pick up some skins if you start eyeing lines across the street on Flagstaff or Superior. You definitely won't need 'em for anything at the resorts.

Medium will work!

For 181's a size Medium should work (171 - 181cm).

Then it will come down to width. These are made in 70, 85, 100, 115, 130 and 140mm widths. For the best fit, measure the ski at its widest point; this will be near the tip. Or, if you know what ski it is, these dimensions will be posted.

Pick the skin width closest to this spec and then trim to fit. ie: A ski measuring 129mm at the tip should use a 130mm skin.

I have used the tip clip system for a few years and have had no issues.
Just got a new set for a different pair of skis!

I got the 115mm for my K2 Obsethed, which are 138-105-125 and they work out great, even though I'm missing some coverage on my tip and tail. As Matthew said above, you'll just have to get it trimmed in the middle (trimmer comes with the skins) and they'll fit on your skis almost perfect, with good coverage on the tip and tail. Have fun, these skins are awesome!

I guess I am old school, but I alway size for the waist of the ski. I hate when I fold them up and I get glue sticking everywhere. That said, I would probably aim for 100 wide to minimize that issue. I agree with Matthew that the tip does not get you much traction anyway.

When sizing up a skin for a ski you want as much coverage as possible. With that being said, we're working in millimeters, a very small measurement, and most of the traction you get when skinning up comes from the last 3/4 of the ski. The tip really doesn't help generate any traction. A 115 skin will obviously get you great coverage underfoot, and in the tail, you'll have 2 mm on either side of the skin, which is basically the thickness of the edge, and material you would have trimmed away anyway if you were cutting the skin to size. And in the front, you will end up about 5 mm on either side, hardly a large amount.

It appears that by getting the 115, you end up with an almost perfectly fitted skin without having to do any trimming except in the middle part of the ski to fit the waist. If you went for the next size up, you would be spending more money and cutting away a lot of material. The 115 is the perfect size. Go for it.

Here is g3's guide for choosing a skin. You will see the 115 fits in perfectly for the size ski you will be using: http://www.genuineguidegear.com/service/g3-learning-centre/skins

Tricky the mediums range from 171-181 and the Large 180-190. I think you would be able to get away with the Medium you will have some tail showing on your larger skis but that should matter since they are twin tipped and the tail doesn't even hit the snow.

I've a pair of last (08/09) season's Alpinist skins. I bought them to go on a pair of Fat-ypus D-Sender skis, and found that the tail clip wouldn't stay on the full twin-tip tail.

Have G3 changed the design of the tail clip this season? If not, then I would avoid these for twin tips. I found that the BD tail clip worked much better.

file a notch in the tail to be sure.

I've never had a problem on my twin tips.

Yes you will be good to go!

Yes, that is what they specifically designed the new tip/tail attachments for.

yes. The trim tool these come with is incredible. I saved it and was more a fan of the BD attachment method, but when I bought their skins their trim tool sucked. Save this tool for use with other pairs of skins. Great great tool for DIY

Def yes on the trim tool.
I got last year's and they came with Savers too, so I'm pretty sure that's a Yes too.

go to black diamond's website- they have a video on how to trim them yourself. There's more to it than you think.

Trim it to the point to where just the edges are showing.

Get the skins that fit the widest part of your ski (except for some extreme fatties) and then trim down to the waist. You'll appreciate the extra coverage.

Dustin, these skins have a set length bracket since there's no folding through a tip loop to adjust for your skis; that's why they come in S, M, L etc.

Pick up the xShort length. Get a width that is close to the widest part of your ski, then open a beer. Trim the width with the included Skin Cutter. It's super easy.

x short 153 - 163 70, 85, 100, 115, 130, 140 411g / 14.5oz - 656g / 23.2oz
Short 162 - 172 70, 85, 100, 115, 130, 140 431g / 15.2oz - 694g / 24.5oz
Medium 171 - 181 70, 85, 100, 115, 130, 140 451g / 15.9oz - 732g / 25.8oz
Long 180 - 190 70, 85, 100, 115, 130, 140 471g / 16.6oz - 769g / 27.1oz
x Long 189 - 199 70, 85, 100, 115, 130, 140 492g / 17.3oz - 807g / 28.5oz

you buy skins based on the width of your skis not really the length as the skins are cut to fit the length of the ski by you. You can either measure the tip of your ski and buy skins that wide or measure the middle of the ski and buy that width. If you buy skins based on the middle width you won't have full coverage and may slip in icy conditions. I always buy skins based on my tip width.