Fluffy pink massage flip flops size S/M

New in the box massage pedicure flip flops with memory foam. I got them as a gift but they are to small. I wear a size 81/2. Small medium would fit 6/81/2 according to the box but they are a little small for me . They have a battery operated massage feature. I just put the batteries in to see if it works. It’s a nice feature to ease tension in your feet, arched and calves. The right one seams a little stronger vibrating than the left maybe the batteries need to be replaced.