Made entirely from hypoallergenic, medical-grade silicone, the O-Feel ring is designed to work in conjunction with Silverette cups to provide an extra layer of protection for the most engorged sensitive breast. Sleep easy knowing your Silverette along with O-Feel will keep up with your body's movements without discomfort or disruption to your lifestyle. With O-Feel, you might even forget your wearing them! Cleaning is easy, soap and water will do the trick. Although not necessary, you can also sterilize them with steam, gamma rays or ethylene oxide. Make nipple soreness one less thing you have to think about!