The ceiling price of USH is $1.10, as users can always deposit the equivalent of $110 of collateral to mint $100 worth of USH. If USH is trading above $1.10, a profit could be made by selling USH on the market.
To establish a floor price for USH, there are two different mechanisms. If a user has a loan and finds USH to be below $1, they can repay their loan at a lower price by buying more USH, in turn stabilizing the price of USH. Alternatively, they can redeem their USH.