ets uit ▁also ▁allows ▁the ▁sk ier ▁to ▁do ▁starts ▁in ▁the ▁water ▁where ▁they ▁lie ▁on ▁their ▁back . ▁Un like ▁a ▁normal ▁life ▁jack et , ▁the ▁" bare foot ▁w ets uit " ▁allows ▁the ▁sk ier ▁to ▁gli de ▁on ▁their ▁back ▁on ▁top ▁of ▁the ▁water ▁once ▁they ▁reach ▁a ▁high ▁enough ▁speed . ▁The ▁bare foot ▁w ets uit ▁is ▁generally ▁th icker ▁in ▁the ▁back , ▁rear , ▁and ▁ch est ▁for ▁fl ot ation ▁and ▁impact ▁absor ption . ▁ ▁B are foot ▁ski ing ▁requires ▁a ▁higher ▁speed ▁because ▁the ▁sk ier ' s ▁feet ▁are ▁smaller ▁than ▁sk is , ▁providing ▁less ▁lift . ▁A ▁rule ▁of ▁thumb ▁for ▁bare foot ▁water ▁ski ing ▁speed ▁in ▁miles ▁per ▁hour ▁is ▁( M / 1 0 )+ 1 8 = S , ▁where ▁M ▁equals ▁the ▁sk ier ' s ▁weight ▁in ▁pounds . ▁In ▁other ▁words , ▁a ▁ ▁person ▁would ▁have ▁to ▁divide ▁ 1 7 5 / 1 0 , ▁which ▁is ▁ 1 7 . 5 ; ▁then ▁simply ▁add ▁ 1 7 . 5 + 1 8 ▁which ▁equals ▁. ▁ ▁Another ▁tool ▁used ▁in ▁bare foot ▁water ▁ski ing ▁is ▁the ▁bare foot ▁bo om . ▁It ▁provides ▁a ▁stable ▁al umin um ▁bar ▁on ▁the ▁side ▁of ▁the ▁boat ▁where ▁a ▁short ▁ro pe ▁can ▁be ▁attached ▁or ▁the ▁sk ier ▁can ▁g rip ▁the ▁bar ▁itself . ▁The ▁sk ier ▁is ▁within ▁ear shot ▁of ▁the