RF socks are made of a polyester fiber which is twisted with pure Silver fibers, then knitted into the sock shape, giving it a very high conductivity (only a few Ohms across) and good shielding performance throughout. Reasonably soft and stretchy with ribbed cuff. Socks include a 1.7 mm male snap near the cuff. Great for RF shielding, grounding, and can even be used for TENS applications. Hand washable. Fits shoe size 5-10. CONTACT US FOR LARGER SIZES. Returns WILL NOT BE ACCEPTED AFTER 30 DAYS OF - even if the product has been shipped by a customer!