Its funny how skiing and skis have changed. 4 or 5 years ago 100mm under foot was a "snowboard", and everyone thought it was just plain stupid or silly. Way before that, 70mm underfoot was huge, beyond comprehension to some who grew up on straight wood sticks with no edges, no base, upwards of 230cm long, and anywhere from 40-60mm underfoot. Nowadays "all mountain" is considered around 100mm underfoot, and powder skis are generally 110mm+, 120mm and 130mm being common. Thank whoever you want to for the progression of gear, but in short Yes, 98mm underfoot will do just fine for powder days.