These @heavyplayllc inner and outer curved sleeves are my current favorite. I play a lot and I rely on my sleeves protecting my cards and lasting heavy play. Had to do it. I am a dad. Been testing 200PCS Transparent Standard Size Inner Card Sleeves Perfect for Double sleeving, 64X89MM TCG Card Sleeves Card Protector for MTG AliExpress 26 Synergy Inner MTG Sleeves (standard Size) Perfect Fit Inner Sleeves for Magic, Yu gi oh!, Pokemon, Trading Card Games, TCG, EDH, Commander Etsy Card Sleeves 101 Inner sleeves are thinner sleeves that are used as a second layer of protection, while outer sleeves are a first line of defense. The outer sleeves can be opaque