Easy to hold - the lightweight design and curved ring makes it easy for babies to hold and use by themselves. The variety of textures on this toy stimulate baby’s sense of touch. Cooling mechanism soothes sore gums - this baby toy is filled with purified water and can be chilled in the refrigerator to maintain a cooling effect on sensitive gums. Relieves teething symptoms in babies 4+ months - this mam cooler baby teether massages and cools baby’s sore gums to provide relief from baby teething symptoms. Premium materials - made from high quality, 100% baby safe, bpa & bps-free material. This mam teething toy and all mam products meet or exceed u.s. & european safety standards.