comfortable and warm: pep fuja's signature mittens . the oyuki pep gtx trigger mittens come with warm primaloft® insulation and a gore-tex® membrane on the inside, while offering a soft, high-quality goatskin on the outside.internal fingers make these gloves a little warmer and more comfortable.the combination of these materials and features makes the pep gtx trigger mittens your companion for the coldest and toughest days of the season.