Our Outer Sleeves Matte Japanese Size add an additional layer of protection to cards and/or art sleeves. They are commonly used to safeguard art sleeves from harm (external double-sleeved protection) and can even serve as a third layer for triple-sleeving purposes. With their matte lamination, these sleeves block annoying reflections to ensure that cards are clearly visible from all angles and avoid symptoms of eye fatigue during gameplay.