No. If you place a bet using a Super Boost selection using your standard balance and your bet is a winner, then all your returns will be made to you as withdrawable cash. However, if you have a free bet credit with bet365 and place a bet on a Super Boost or even a standard Boosted market then you will only receive the winning portion of your returns as withdrawable cash. As is customary for Bet Credits, your stake is not returned with any winnings accrued from a bet using this source of funds on bet365.