Bright Star ECO Friendly Boy&rsquo;s Heavyweight Thermal Sock-4 Pairs (Size 8-10) ECO FRIENDLY recycled cotton thermal boot socks. Great quality kids thermal socks. No More Cold Feet Boys! Full cushioning for comfort. Full padded cushion. Polyester cotton blend. Reciprocated heel and toe keep sock in place. Smooth flat toe seam adds comfort and durability.