These SS1B Soft Thyroid Shields provides the most in comfort. The velcro closure allows it to be easier to be put on and off. Nylon binding around the outside of the shield at a very economical price. The nylon covering has inside seams around the neck for a soft surface. The ample strap length fits almost every neck size. Protection is around the entire neck, not just the front, as some companies. Hook and loop closure enable a comfortable and close fit. Lite Lead, .5mm Lead Pb Equivalency