Glossary
Double-sleeving
Also called: double sleeve, double sleeved
Double-sleeving means putting a card in a thin inner sleeve and then a second outer sleeve, so that no opening in either sleeve is left exposed.
The standard method is to slide the card into an inner sleeve, then load it into the outer sleeve from the opposite end. The inner sleeve's opening ends up at the closed bottom of the outer sleeve, sealing the card between the two.
It is mostly done for cards that get played rather than cards that sit still. A card that is shuffled hundreds of times a month is exposed to sweat, table grit and moisture in a way a binder card is not.
The costs are real. The deck becomes noticeably thicker and may no longer fit its deck box, sleeves become harder to shuffle, and you have doubled the number of sleeves you are buying.
It also does nothing about bending. Double-sleeving protects surfaces and edges; it will not save a card from a crease.