EMF Radiation Protection Shielding Woman Baby Maternity Cami Dresses 8900603 50% Silver-Nylon Blend, 50% Nylon Provides reliable protection up to 50 dB Shielding Effectiveness for frequencies from 10 MHz to 3 GHz and beyond Wear this camisole as an undershirt to reduce the risks of everyday radiation for your unborn child, it blocks excess RF radiation but not for fully blocking cell phone signals purpose Very sheer, comfortable, and safe on skin Maternity sizes: 42 inches (108 cm) at chest; 52 inches (132 cm) at belly and 25 inches (65 cm) long; adjustable straps, lace details Care, hand wash, air dry, do not bleach, do not dry clean