Stay warmer and more comfortable in these socks featuring an insulating 2mm neoprene shell and soft fleece lining. Stretchy fleece lining is comfortable next to your skin, plus it wicks away moisture. Made of 2mm mesh skin/nylon neoprene for a comfortable, form-fitting silhouette and excellent flexibility. Rubberized grip pattern on sole sticks to the footbed of sandals, wet or dry, for excellent performance. Flatlock stitch construction enhances comfort.