These are massage slippers, also known as acupressure or reflexology slippers. They have raised nodules on the insole that stimulate pressure points on the soles of the feet. This stimulation is thought to improve circulation, relieve pain, and promote relaxation.
The slippers are designed with adjustable straps for a comfortable fit. They can be used at home or in the shower. They are made of materials like EVA, silicone, and wood.