Easy access for baby to self soothe their teething pain. Hands-free for parent's Interchangeable between hands. Flip mitt and make sure thumb area is always where baby's thumb is. Protects baby's hands from skin damage from excess saliva and chewing Sensory stimulating crinkle noise. Soft and flexible teething surface made of 100% food-grade silicone, BPA & Phthalate free.