Hi,
l am 5 feet 2 inches, 100 pounds, size 6 in womens boots, 20 years old. l am looking to get the k2 kandi snowboard. Which size should l get 134 cm or 137 cm? Thanks

Put the board up to you and it should come up to mid neck area. If you want speed, upper neck/under chin.

Do not just pick a board between ur nose & chin that is a rookie mistake
You need to take into account a few things ur height,weight,riding conditions,riding style''all mountain,freeride,freestylefoot size & skill lvl
Once u get those nailed down u can narrow down ur board genre & size, Generally people go largest on freeride boards for stable carving & float in pow, Mid range for an all mountain board & smallest for those park rats.

That is why just picking a board between ur nose & chin does not work & is a huge mistake, If l was looking for a more backcountry oriented board l would not just pick a board between my nose & chin cause I'd want extra length in the board to help for stable carving & float in pow, samething works for picking a board for the park/freestyle, l would not just pick a board between my chin & nose for it, I'd want to focus more on a shorter end board to help with maneuverability,butters & just dorking around on runs.

Some simple guidelines u can follow as well is remembering that the longer the board the more stable it will be for u during high speed carves & it will have an easier time floating in powder, the shorter the board the easier it will be to maneuver around & butter.

You can use this site to find a size range however with time u will learn whether u like a shorter or longer board for certain types of riding.
http://frostyrider.com/tips/size-guide.htm