technical performance in all weather conditions . the oyuki tamashii mittens come with warm primaloft® insulation and a gore-tex® membrane inside, while offering a soft, high-quality goatskin on the outside.the reinforcement on the thumb ensures durability and the ykk® side zip makes it even more comfortable to put the gloves on.the combination of these materials and features makes the tamashii mittens your companion for every day and every condition of the season.