no you dont. i have been riding a 70 under foot racing ski in pow this whole winter, have been in europe, couldent bring my skis. you actually have to be centered, or even lean a bit foreward. next time there is a big pow day at your resort ride some skinny ass skis and learn how to pressure your tips. i think it has helped me ski pow so much, and when i get back on my 138 under foot praxis skiing deep snow is going to be so easey. its silly to think you cant ride well just because you dont have a fatty. watch an old ski movie or ask your dad how it was, they still had a hell of a lot of fun in deep snow.