These are our take on the Boo Boo Bunny. You no longer need a ice cube. Our bunnys are filled with flax seed, lavender and chamomile. Store in freezer till they are needed. The flax seed stays cool while the herbs help to sooth the mind and spirit. Ours are called Boo Boo Bunny slippers because we have added the no slip fabric to the bottoms! The really are mini slippers.