These very light-weight slipper socks are incredibly warm because the main ingredient in them is alpaca! What makes them extra special is the alpaca shaped "grippers" on the bottom. So many times you slip and slide on tile or hardwood floors in your comfy socks. These little grippers put all that slipping to a stop! Very lightweight and thin, these can be worn all year long ensuring your feet are toasty warm and your body is sure-footed, no matter how slippery the floor may be.