Don't worry. Put them in a hot dryer for 2-3 minutes. As soon as they come out, put on a pair of very thick socks, or several pair if you don't have thick. Also, as soon as they come out of the dryer, pull back on the strap - BE CAREFUL, the strap will be very pliable and you don't want to stretch them too far. Wear them with the socks until they are totally cooled off and you will have them back to the way you like them.